Claude: File chunking system

FILESYSTEM_CHUNKED_TRANSFER.md

@@ -0,0 +1,211 @@
+# Chunked Filesystem Transfer System
+
+This system enables chunked file uploads and downloads between the client (web browser) and ESP32 over WebSocket, overcoming the 1KB per stream limitation.
+
+## Architecture
+
+### Protocol Messages (Protobuf)
+
+The system uses Protocol Buffers for efficient binary messaging with the following operations:
+
+1. **Delete**: Remove files or directories
+2. **Mkdir**: Create directories
+3. **List**: List files and directories
+4. **Download**: Transfer files from ESP32 to client (chunked)
+5. **Upload**: Transfer files from client to ESP32 (chunked)
+6. **Cancel**: Cancel ongoing transfers
+
+### Chunked Transfer Flow
+
+#### Download (ESP32 → Client)
+
+1. Client sends `FSDownloadStartRequest` with file path
+2. ESP32 responds with `FSDownloadStartResponse` containing:
+   - Transfer ID
+   - File size
+   - Chunk size (1024 bytes max)
+   - Total chunks
+3. Client requests chunks sequentially using `FSDownloadChunkRequest`
+4. ESP32 sends each chunk via `FSDownloadChunkResponse`
+5. Transfer completes when last chunk is received
+
+#### Upload (Client → ESP32)
+
+1. Client sends `FSUploadStartRequest` with destination path and file size
+2. ESP32 responds with `FSUploadStartResponse` containing:
+   - Transfer ID
+   - Max chunk size (1024 bytes)
+3. Client sends chunks sequentially using `FSUploadChunkRequest`
+4. ESP32 responds with `FSUploadChunkResponse` after each chunk
+5. Transfer completes when last chunk is written
+
+## Implementation Details
+
+### ESP32 Side
+
+**Files:**
+- `esp32/include/filesystem_ws.h` - Header file with handler class definition
+- `esp32/src/filesystem_ws.cpp` - Implementation of filesystem operations
+- `esp32/include/communication/proto_helpers.h` - Message traits for protobuf
+
+**Key Features:**
+- Transfer state management with automatic cleanup
+- Timeout handling (30 seconds of inactivity)
+- Recursive directory deletion
+- File integrity verification
+
+**Integration:**
+You need to integrate the filesystem handlers into your WebSocket message handling. In your main WebSocket handler, add:
+
+```cpp
+#include <filesystem_ws.h>
+
+// In your correlation request handler:
+void handleCorrelationRequest(const socket_message_CorrelationRequest& request, int clientId) {
+    socket_message_CorrelationResponse response;
+
+    // ... existing handlers ...
+
+    if (request.which_request == socket_message_CorrelationRequest_fs_delete_request_tag) {
+        response.which_response = socket_message_CorrelationResponse_fs_delete_response_tag;
+        response.response.fs_delete_response =
+            FileSystemWS::fsHandler.handleDelete(request.request.fs_delete_request);
+    }
+    else if (request.which_request == socket_message_CorrelationRequest_fs_mkdir_request_tag) {
+        response.which_response = socket_message_CorrelationResponse_fs_mkdir_response_tag;
+        response.response.fs_mkdir_response =
+            FileSystemWS::fsHandler.handleMkdir(request.request.fs_mkdir_request);
+    }
+    else if (request.which_request == socket_message_CorrelationRequest_fs_list_request_tag) {
+        response.which_response = socket_message_CorrelationResponse_fs_list_response_tag;
+        response.response.fs_list_response =
+            FileSystemWS::fsHandler.handleList(request.request.fs_list_request);
+    }
+    else if (request.which_request == socket_message_CorrelationRequest_fs_download_start_request_tag) {
+        response.which_response = socket_message_CorrelationResponse_fs_download_start_response_tag;
+        response.response.fs_download_start_response =
+            FileSystemWS::fsHandler.handleDownloadStart(request.request.fs_download_start_request);
+    }
+    else if (request.which_request == socket_message_CorrelationRequest_fs_download_chunk_request_tag) {
+        response.which_response = socket_message_CorrelationResponse_fs_download_chunk_response_tag;
+        response.response.fs_download_chunk_response =
+            FileSystemWS::fsHandler.handleDownloadChunk(request.request.fs_download_chunk_request);
+    }
+    else if (request.which_request == socket_message_CorrelationRequest_fs_upload_start_request_tag) {
+        response.which_response = socket_message_CorrelationResponse_fs_upload_start_response_tag;
+        response.response.fs_upload_start_response =
+            FileSystemWS::fsHandler.handleUploadStart(request.request.fs_upload_start_request);
+    }
+    else if (request.which_request == socket_message_CorrelationRequest_fs_upload_chunk_request_tag) {
+        response.which_response = socket_message_CorrelationResponse_fs_upload_chunk_response_tag;
+        response.response.fs_upload_chunk_response =
+            FileSystemWS::fsHandler.handleUploadChunk(request.request.fs_upload_chunk_request);
+    }
+    else if (request.which_request == socket_message_CorrelationRequest_fs_cancel_transfer_request_tag) {
+        response.which_response = socket_message_CorrelationResponse_fs_cancel_transfer_response_tag;
+        response.response.fs_cancel_transfer_response =
+            FileSystemWS::fsHandler.handleCancelTransfer(request.request.fs_cancel_transfer_request);
+    }
+
+    // Send response back to client
+    sendCorrelationResponse(response, clientId);
+}
+
+// Optionally, in your main loop or timer:
+void loop() {
+    // Clean up expired transfers periodically
+    FileSystemWS::fsHandler.cleanupExpiredTransfers();
+}
+```
+
+### Client Side (TypeScript/Svelte)
+
+**Files:**
+- `app/src/lib/filesystem/chunkedTransfer.ts` - Client library for file transfers
+- `app/src/lib/components/filesystem/FileManager.svelte` - Example UI component
+
+**Usage Example:**
+
+```typescript
+import { fileSystemClient } from '$lib/filesystem/chunkedTransfer'
+
+// Upload a file
+const file = new File(['Hello World'], 'test.txt')
+const result = await fileSystemClient.uploadFileFromBrowser('/test.txt', file, (progress) => {
+    console.log(`Upload: ${progress.percentage}%`)
+})
+
+// Download a file
+const download = await fileSystemClient.downloadFileAndSave(
+    '/test.txt',
+    'test.txt',
+    (progress) => {
+        console.log(`Download: ${progress.percentage}%`)
+    }
+)
+
+// List directory
+const listing = await fileSystemClient.listDirectory('/')
+console.log('Files:', listing.files)
+console.log('Directories:', listing.directories)
+
+// Create directory
+await fileSystemClient.createDirectory('/new_folder')
+
+// Delete file
+await fileSystemClient.deleteFile('/old_file.txt')
+```
+
+## Configuration
+
+### Maximum Chunk Size
+
+Currently set to 1024 bytes (`FS_MAX_CHUNK_SIZE`) to work within ESP32 WebSocket frame limitations. Adjust if your setup allows larger frames.
+
+### Transfer Timeout
+
+Transfers inactive for 30 seconds (`FS_TRANSFER_TIMEOUT`) are automatically cleaned up. Increase for slower connections.
+
+## Error Handling
+
+- Network errors: Transfers are automatically cancelled
+- Timeouts: Inactive transfers are cleaned up on ESP32
+- File errors: Detailed error messages returned to client
+- Partial uploads: Cancelled uploads delete the partial file on ESP32
+
+## Performance Considerations
+
+- **Sequential Chunks**: Chunks are sent sequentially to ensure order and reliability
+- **Memory Usage**: ESP32 keeps one File handle open per active transfer
+- **Browser Memory**: Downloads buffer entire file in memory before saving
+- **Network**: ~1KB per message overhead due to protobuf encoding
+
+## Security Notes
+
+- No authentication/authorization implemented - add as needed
+- Path traversal: Validate paths to prevent access outside allowed directories
+- File size limits: Consider adding max file size restrictions
+- Rate limiting: Consider limiting concurrent transfers per client
+
+## Testing
+
+1. Build and flash the ESP32 firmware
+2. Run the web application
+3. Navigate to the FileManager component
+4. Test upload/download with files of various sizes
+
+## Troubleshooting
+
+**Transfer fails midway:**
+- Check WebSocket connection stability
+- Verify ESP32 has sufficient filesystem space
+- Check for timeout issues
+
+**Upload creates corrupted files:**
+- Verify chunk order is preserved
+- Check for protobuf encoding/decoding errors
+
+**ESP32 runs out of memory:**
+- Reduce number of concurrent transfers
+- Close File handles properly after transfers
+- Run cleanup more frequently

app/env.d.ts

@@ -1,8 +1,8 @@
-declare module 'app-env' {
-    interface ENV {
-        VITE_USE_HOST_NAME: boolean
-    }
+declare module "app-env" {
+  interface ENV {
+    VITE_USE_HOST_NAME: boolean;
+  }
 
-    const appEnv: ENV
-    export default appEnv
+  const appEnv: ENV;
+  export default appEnv;
 }

app/src/lib/components/filesystem/FileManager.svelte

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+<script lang="ts">
+	import { fileSystemClient, type TransferProgress } from '$lib/filesystem/chunkedTransfer'
+	import { onMount } from 'svelte'
+
+	let currentPath = '/'
+	let files: Array<{ name: string; size: number }> = []
+	let directories: Array<{ name: string }> = []
+	let loading = false
+	let error = ''
+	let uploadProgress: TransferProgress | null = null
+	let downloadProgress: TransferProgress | null = null
+
+	async function loadDirectory() {
+		loading = true
+		error = ''
+		try {
+			const result = await fileSystemClient.listDirectory(currentPath)
+			if (result.success) {
+				files = result.files
+				directories = result.directories
+			} else {
+				error = result.error || 'Failed to load directory'
+			}
+		} catch (e) {
+			error = e instanceof Error ? e.message : 'Unknown error'
+		} finally {
+			loading = false
+		}
+	}
+
+	async function navigateTo(path: string) {
+		currentPath = path
+		await loadDirectory()
+	}
+
+	async function handleFileUpload(event: Event) {
+		const input = event.target as HTMLInputElement
+		const file = input.files?.[0]
+		if (!file) return
+
+		uploadProgress = null
+		error = ''
+
+		const destinationPath = currentPath.endsWith('/')
+			? currentPath + file.name
+			: currentPath + '/' + file.name
+
+		try {
+			const result = await fileSystemClient.uploadFileFromBrowser(
+				destinationPath,
+				file,
+				(progress) => {
+					uploadProgress = progress
+				}
+			)
+
+			if (result.success) {
+				await loadDirectory()
+			} else {
+				error = result.error || 'Upload failed'
+			}
+		} catch (e) {
+			error = e instanceof Error ? e.message : 'Upload error'
+		} finally {
+			uploadProgress = null
+			input.value = ''
+		}
+	}
+
+	async function handleDownload(filename: string) {
+		downloadProgress = null
+		error = ''
+
+		const filePath = currentPath.endsWith('/')
+			? currentPath + filename
+			: currentPath + '/' + filename
+
+		try {
+			const result = await fileSystemClient.downloadFileAndSave(filePath, filename, (progress) => {
+				downloadProgress = progress
+			})
+
+			if (!result.success) {
+				error = result.error || 'Download failed'
+			}
+		} catch (e) {
+			error = e instanceof Error ? e.message : 'Download error'
+		} finally {
+			downloadProgress = null
+		}
+	}
+
+	async function handleDelete(name: string, isDirectory: boolean) {
+		if (!confirm(`Delete ${isDirectory ? 'directory' : 'file'} "${name}"?`)) return
+
+		error = ''
+		const path = currentPath.endsWith('/') ? currentPath + name : currentPath + '/' + name
+
+		try {
+			const result = await fileSystemClient.deleteFile(path)
+			if (result.success) {
+				await loadDirectory()
+			} else {
+				error = result.error || 'Delete failed'
+			}
+		} catch (e) {
+			error = e instanceof Error ? e.message : 'Delete error'
+		}
+	}
+
+	async function handleCreateDirectory() {
+		const name = prompt('Enter directory name:')
+		if (!name) return
+
+		error = ''
+		const path = currentPath.endsWith('/') ? currentPath + name : currentPath + '/' + name
+
+		try {
+			const result = await fileSystemClient.createDirectory(path)
+			if (result.success) {
+				await loadDirectory()
+			} else {
+				error = result.error || 'Failed to create directory'
+			}
+		} catch (e) {
+			error = e instanceof Error ? e.message : 'Error creating directory'
+		}
+	}
+
+	function formatBytes(bytes: number): string {
+		if (bytes === 0) return '0 B'
+		const k = 1024
+		const sizes = ['B', 'KB', 'MB', 'GB']
+		const i = Math.floor(Math.log(bytes) / Math.log(k))
+		return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i]
+	}
+
+	onMount(() => {
+		loadDirectory()
+	})
+</script>
+
+<div class="file-manager">
+	<div class="toolbar">
+		<h2>File Manager</h2>
+		<div class="path">Current: {currentPath}</div>
+		<div class="actions">
+			<button on:click={handleCreateDirectory}>New Folder</button>
+			<label class="upload-btn">
+				Upload File
+				<input type="file" on:change={handleFileUpload} style="display: none;" />
+			</label>
+			<button on:click={loadDirectory}>Refresh</button>
+		</div>
+	</div>
+
+	{#if error}
+		<div class="error">{error}</div>
+	{/if}
+
+	{#if uploadProgress}
+		<div class="progress">
+			<div class="progress-label">
+				Uploading: {uploadProgress.percentage.toFixed(1)}% ({formatBytes(
+					uploadProgress.bytesTransferred
+				)} / {formatBytes(uploadProgress.totalBytes)})
+			</div>
+			<div class="progress-bar">
+				<div class="progress-fill" style="width: {uploadProgress.percentage}%"></div>
+			</div>
+		</div>
+	{/if}
+
+	{#if downloadProgress}
+		<div class="progress">
+			<div class="progress-label">
+				Downloading: {downloadProgress.percentage.toFixed(1)}% ({formatBytes(
+					downloadProgress.bytesTransferred
+				)} / {formatBytes(downloadProgress.totalBytes)})
+			</div>
+			<div class="progress-bar">
+				<div class="progress-fill" style="width: {downloadProgress.percentage}%"></div>
+			</div>
+		</div>
+	{/if}
+
+	<div class="file-list">
+		{#if loading}
+			<div class="loading">Loading...</div>
+		{:else}
+			{#if currentPath !== '/'}
+				<div class="file-item directory" on:click={() => navigateTo('/')}>
+					<span class="icon">📁</span>
+					<span class="name">..</span>
+				</div>
+			{/if}
+
+			{#each directories as dir}
+				<div class="file-item directory">
+					<span class="icon">📁</span>
+					<span class="name" on:click={() => navigateTo(currentPath + '/' + dir.name)}
+						>{dir.name}</span
+					>
+					<button class="delete-btn" on:click={() => handleDelete(dir.name, true)}>Delete</button>
+				</div>
+			{/each}
+
+			{#each files as file}
+				<div class="file-item">
+					<span class="icon">📄</span>
+					<span class="name">{file.name}</span>
+					<span class="size">{formatBytes(file.size)}</span>
+					<button class="download-btn" on:click={() => handleDownload(file.name)}>Download</button>
+					<button class="delete-btn" on:click={() => handleDelete(file.name, false)}>Delete</button>
+				</div>
+			{/each}
+
+			{#if files.length === 0 && directories.length === 0}
+				<div class="empty">Directory is empty</div>
+			{/if}
+		{/if}
+	</div>
+</div>
+
+<style>
+	.file-manager {
+		max-width: 800px;
+		margin: 2rem auto;
+		padding: 1rem;
+		border: 1px solid #ddd;
+		border-radius: 8px;
+		background: white;
+	}
+
+	.toolbar {
+		margin-bottom: 1rem;
+	}
+
+	.toolbar h2 {
+		margin: 0 0 0.5rem 0;
+	}
+
+	.path {
+		font-family: monospace;
+		background: #f5f5f5;
+		padding: 0.5rem;
+		border-radius: 4px;
+		margin-bottom: 0.5rem;
+	}
+
+	.actions {
+		display: flex;
+		gap: 0.5rem;
+	}
+
+	.actions button,
+	.upload-btn {
+		padding: 0.5rem 1rem;
+		background: #007bff;
+		color: white;
+		border: none;
+		border-radius: 4px;
+		cursor: pointer;
+	}
+
+	.actions button:hover,
+	.upload-btn:hover {
+		background: #0056b3;
+	}
+
+	.error {
+		background: #f8d7da;
+		color: #721c24;
+		padding: 0.75rem;
+		border-radius: 4px;
+		margin-bottom: 1rem;
+	}
+
+	.progress {
+		margin-bottom: 1rem;
+	}
+
+	.progress-label {
+		margin-bottom: 0.5rem;
+		font-size: 0.9rem;
+	}
+
+	.progress-bar {
+		height: 20px;
+		background: #e9ecef;
+		border-radius: 4px;
+		overflow: hidden;
+	}
+
+	.progress-fill {
+		height: 100%;
+		background: #28a745;
+		transition: width 0.3s ease;
+	}
+
+	.file-list {
+		border: 1px solid #ddd;
+		border-radius: 4px;
+		min-height: 200px;
+	}
+
+	.file-item {
+		display: flex;
+		align-items: center;
+		padding: 0.75rem;
+		border-bottom: 1px solid #eee;
+		gap: 0.5rem;
+	}
+
+	.file-item:last-child {
+		border-bottom: none;
+	}
+
+	.file-item.directory {
+		background: #f8f9fa;
+	}
+
+	.icon {
+		font-size: 1.5rem;
+	}
+
+	.name {
+		flex: 1;
+		cursor: pointer;
+	}
+
+	.name:hover {
+		text-decoration: underline;
+	}
+
+	.size {
+		color: #6c757d;
+		font-size: 0.9rem;
+	}
+
+	.download-btn,
+	.delete-btn {
+		padding: 0.25rem 0.75rem;
+		border: none;
+		border-radius: 4px;
+		cursor: pointer;
+		font-size: 0.9rem;
+	}
+
+	.download-btn {
+		background: #28a745;
+		color: white;
+	}
+
+	.download-btn:hover {
+		background: #218838;
+	}
+
+	.delete-btn {
+		background: #dc3545;
+		color: white;
+	}
+
+	.delete-btn:hover {
+		background: #c82333;
+	}
+
+	.loading,
+	.empty {
+		text-align: center;
+		padding: 2rem;
+		color: #6c757d;
+	}
+</style>

app/src/lib/filesystem/chunkedTransfer.ts

@@ -0,0 +1,326 @@
+import { socket } from '$lib/stores/socket'
+import * as Messages from '$lib/platform_shared/message'
+import type {
+	FSDeleteRequest,
+	FSMkdirRequest,
+	FSListRequest,
+	FSDownloadStartRequest,
+	FSDownloadChunkRequest,
+	FSUploadStartRequest,
+	FSUploadChunkRequest,
+	FSCancelTransferRequest,
+	CorrelationResponse
+} from '$lib/platform_shared/message'
+
+const MAX_CHUNK_SIZE = 1024
+
+export interface FileInfo {
+	name: string
+	size: number
+}
+
+export interface DirectoryInfo {
+	name: string
+}
+
+export interface ListResult {
+	success: boolean
+	error?: string
+	files: FileInfo[]
+	directories: DirectoryInfo[]
+}
+
+export interface TransferProgress {
+	transferId: string
+	bytesTransferred: number
+	totalBytes: number
+	chunksCompleted: number
+	totalChunks: number
+	percentage: number
+}
+
+export type ProgressCallback = (progress: TransferProgress) => void
+
+export class FileSystemClient {
+	/**
+	 * Delete a file or directory on the ESP32
+	 */
+	async deleteFile(path: string): Promise<{ success: boolean; error?: string }> {
+		const request: FSDeleteRequest = { path }
+
+		const response = await socket.request({
+			fsDeleteRequest: request
+		})
+
+		if (response.fsDeleteResponse) {
+			return {
+				success: response.fsDeleteResponse.success,
+				error: response.fsDeleteResponse.error || undefined
+			}
+		}
+
+		return { success: false, error: 'No response received' }
+	}
+
+	/**
+	 * Create a directory on the ESP32
+	 */
+	async createDirectory(path: string): Promise<{ success: boolean; error?: string }> {
+		const request: FSMkdirRequest = { path }
+
+		const response = await socket.request({
+			fsMkdirRequest: request
+		})
+
+		if (response.fsMkdirResponse) {
+			return {
+				success: response.fsMkdirResponse.success,
+				error: response.fsMkdirResponse.error || undefined
+			}
+		}
+
+		return { success: false, error: 'No response received' }
+	}
+
+	/**
+	 * List files and directories at the given path
+	 */
+	async listDirectory(path: string = '/'): Promise<ListResult> {
+		const request: FSListRequest = { path }
+
+		const response = await socket.request({
+			fsListRequest: request
+		})
+
+		if (response.fsListResponse) {
+			const resp = response.fsListResponse
+			return {
+				success: resp.success,
+				error: resp.error || undefined,
+				files: (resp.files || []).map((f) => ({ name: f.name, size: f.size })),
+				directories: (resp.directories || []).map((d) => ({ name: d.name }))
+			}
+		}
+
+		return { success: false, error: 'No response received', files: [], directories: [] }
+	}
+
+	/**
+	 * Download a file from the ESP32
+	 */
+	async downloadFile(
+		path: string,
+		onProgress?: ProgressCallback
+	): Promise<{ success: boolean; data?: Uint8Array; error?: string }> {
+		// Start download
+		const startRequest: FSDownloadStartRequest = { path }
+
+		const startResponse = await socket.request({
+			fsDownloadStartRequest: startRequest
+		})
+
+		if (!startResponse.fsDownloadStartResponse) {
+			return { success: false, error: 'Failed to start download' }
+		}
+
+		const startResp = startResponse.fsDownloadStartResponse
+
+		if (!startResp.success) {
+			return { success: false, error: startResp.error || 'Failed to start download' }
+		}
+
+		const transferId = startResp.transferId
+		const totalChunks = startResp.totalChunks
+		const fileSize = startResp.fileSize
+
+		// Allocate buffer for entire file
+		const buffer = new Uint8Array(fileSize)
+		let offset = 0
+
+		// Download chunks sequentially
+		for (let chunkIndex = 0; chunkIndex < totalChunks; chunkIndex++) {
+			const chunkRequest: FSDownloadChunkRequest = {
+				transferId,
+				chunkIndex
+			}
+
+			const chunkResponse = await socket.request({
+				fsDownloadChunkRequest: chunkRequest
+			})
+
+			if (!chunkResponse.fsDownloadChunkResponse) {
+				await this.cancelTransfer(transferId)
+				return { success: false, error: `Failed to download chunk ${chunkIndex}` }
+			}
+
+			const chunkResp = chunkResponse.fsDownloadChunkResponse
+
+			if (chunkResp.error) {
+				await this.cancelTransfer(transferId)
+				return { success: false, error: chunkResp.error }
+			}
+
+			// Copy chunk data to buffer
+			if (chunkResp.data) {
+				buffer.set(chunkResp.data, offset)
+				offset += chunkResp.data.length
+			}
+
+			// Report progress
+			if (onProgress) {
+				onProgress({
+					transferId,
+					bytesTransferred: offset,
+					totalBytes: fileSize,
+					chunksCompleted: chunkIndex + 1,
+					totalChunks,
+					percentage: ((chunkIndex + 1) / totalChunks) * 100
+				})
+			}
+		}
+
+		return { success: true, data: buffer }
+	}
+
+	/**
+	 * Upload a file to the ESP32
+	 */
+	async uploadFile(
+		path: string,
+		data: Uint8Array,
+		onProgress?: ProgressCallback
+	): Promise<{ success: boolean; error?: string }> {
+		const fileSize = data.length
+		const chunkSize = MAX_CHUNK_SIZE
+		const totalChunks = Math.ceil(fileSize / chunkSize)
+
+		// Start upload
+		const startRequest: FSUploadStartRequest = {
+			path,
+			fileSize,
+			chunkSize
+		}
+
+		const startResponse = await socket.request({
+			fsUploadStartRequest: startRequest
+		})
+
+		if (!startResponse.fsUploadStartResponse) {
+			return { success: false, error: 'Failed to start upload' }
+		}
+
+		const startResp = startResponse.fsUploadStartResponse
+
+		if (!startResp.success) {
+			return { success: false, error: startResp.error || 'Failed to start upload' }
+		}
+
+		const transferId = startResp.transferId
+		const maxChunkSize = startResp.maxChunkSize || MAX_CHUNK_SIZE
+
+		// Upload chunks sequentially
+		for (let chunkIndex = 0; chunkIndex < totalChunks; chunkIndex++) {
+			const offset = chunkIndex * chunkSize
+			const end = Math.min(offset + chunkSize, fileSize)
+			const chunkData = data.slice(offset, end)
+			const isLast = chunkIndex === totalChunks - 1
+
+			const chunkRequest: FSUploadChunkRequest = {
+				transferId,
+				chunkIndex,
+				data: chunkData,
+				isLast
+			}
+
+			const chunkResponse = await socket.request({
+				fsUploadChunkRequest: chunkRequest
+			})
+
+			if (!chunkResponse.fsUploadChunkResponse) {
+				await this.cancelTransfer(transferId)
+				return { success: false, error: `Failed to upload chunk ${chunkIndex}` }
+			}
+
+			const chunkResp = chunkResponse.fsUploadChunkResponse
+
+			if (!chunkResp.success) {
+				await this.cancelTransfer(transferId)
+				return { success: false, error: chunkResp.error || 'Failed to upload chunk' }
+			}
+
+			// Report progress
+			if (onProgress) {
+				onProgress({
+					transferId,
+					bytesTransferred: end,
+					totalBytes: fileSize,
+					chunksCompleted: chunkIndex + 1,
+					totalChunks,
+					percentage: ((chunkIndex + 1) / totalChunks) * 100
+				})
+			}
+		}
+
+		return { success: true }
+	}
+
+	/**
+	 * Cancel an ongoing transfer
+	 */
+	async cancelTransfer(transferId: string): Promise<{ success: boolean }> {
+		const request: FSCancelTransferRequest = { transferId }
+
+		const response = await socket.request({
+			fsCancelTransferRequest: request
+		})
+
+		if (response.fsCancelTransferResponse) {
+			return { success: response.fsCancelTransferResponse.success }
+		}
+
+		return { success: false }
+	}
+
+	/**
+	 * Helper: Upload a File object from browser
+	 */
+	async uploadFileFromBrowser(
+		destinationPath: string,
+		file: File,
+		onProgress?: ProgressCallback
+	): Promise<{ success: boolean; error?: string }> {
+		const arrayBuffer = await file.arrayBuffer()
+		const data = new Uint8Array(arrayBuffer)
+		return this.uploadFile(destinationPath, data, onProgress)
+	}
+
+	/**
+	 * Helper: Download a file and save it to browser
+	 */
+	async downloadFileAndSave(
+		path: string,
+		filename: string,
+		onProgress?: ProgressCallback
+	): Promise<{ success: boolean; error?: string }> {
+		const result = await this.downloadFile(path, onProgress)
+
+		if (!result.success || !result.data) {
+			return { success: false, error: result.error }
+		}
+
+		// Create blob and trigger download
+		const blob = new Blob([result.data])
+		const url = URL.createObjectURL(blob)
+		const a = document.createElement('a')
+		a.href = url
+		a.download = filename
+		document.body.appendChild(a)
+		a.click()
+		document.body.removeChild(a)
+		URL.revokeObjectURL(url)
+
+		return { success: true }
+	}
+}
+
+export const fileSystemClient = new FileSystemClient()

esp32/include/communication/proto_helpers.h

@@ -41,6 +41,22 @@ DEFINE_MESSAGE_TRAITS(ServoPWMData, servo_pwm)
 DEFINE_MESSAGE_TRAITS(ServoStateData, servo_state)
 DEFINE_MESSAGE_TRAITS(CorrelationRequest, correlation_request)
 DEFINE_MESSAGE_TRAITS(CorrelationResponse, correlation_response)
+DEFINE_MESSAGE_TRAITS(FSDeleteRequest, fs_delete_request)
+DEFINE_MESSAGE_TRAITS(FSDeleteResponse, fs_delete_response)
+DEFINE_MESSAGE_TRAITS(FSMkdirRequest, fs_mkdir_request)
+DEFINE_MESSAGE_TRAITS(FSMkdirResponse, fs_mkdir_response)
+DEFINE_MESSAGE_TRAITS(FSListRequest, fs_list_request)
+DEFINE_MESSAGE_TRAITS(FSListResponse, fs_list_response)
+DEFINE_MESSAGE_TRAITS(FSDownloadStartRequest, fs_download_start_request)
+DEFINE_MESSAGE_TRAITS(FSDownloadStartResponse, fs_download_start_response)
+DEFINE_MESSAGE_TRAITS(FSDownloadChunkRequest, fs_download_chunk_request)
+DEFINE_MESSAGE_TRAITS(FSDownloadChunkResponse, fs_download_chunk_response)
+DEFINE_MESSAGE_TRAITS(FSUploadStartRequest, fs_upload_start_request)
+DEFINE_MESSAGE_TRAITS(FSUploadStartResponse, fs_upload_start_response)
+DEFINE_MESSAGE_TRAITS(FSUploadChunkRequest, fs_upload_chunk_request)
+DEFINE_MESSAGE_TRAITS(FSUploadChunkResponse, fs_upload_chunk_response)
+DEFINE_MESSAGE_TRAITS(FSCancelTransferRequest, fs_cancel_transfer_request)
+DEFINE_MESSAGE_TRAITS(FSCancelTransferResponse, fs_cancel_transfer_response)
 
 #undef DEFINE_MESSAGE_TRAITS
 

esp32/include/filesystem_ws.h

@@ -0,0 +1,62 @@
+#pragma once
+
+#include <LittleFS.h>
+#include <platform_shared/message.pb.h>
+#include <map>
+#include <string>
+
+#define FS_MAX_CHUNK_SIZE 1024
+#define FS_TRANSFER_TIMEOUT 30000  // 30 seconds
+
+namespace FileSystemWS {
+
+struct TransferState {
+    std::string path;
+    File file;
+    uint32_t fileSize;
+    uint32_t chunkSize;
+    uint32_t totalChunks;
+    uint32_t chunksProcessed;
+    uint32_t lastActivityTime;
+    bool isUpload;
+};
+
+class FileSystemHandler {
+  public:
+    FileSystemHandler();
+
+    // Delete file/directory
+    socket_message_FSDeleteResponse handleDelete(const socket_message_FSDeleteRequest& req);
+
+    // Create directory
+    socket_message_FSMkdirResponse handleMkdir(const socket_message_FSMkdirRequest& req);
+
+    // List directory
+    socket_message_FSListResponse handleList(const socket_message_FSListRequest& req);
+
+    // Download operations (ESP -> Client)
+    socket_message_FSDownloadStartResponse handleDownloadStart(const socket_message_FSDownloadStartRequest& req);
+    socket_message_FSDownloadChunkResponse handleDownloadChunk(const socket_message_FSDownloadChunkRequest& req);
+
+    // Upload operations (Client -> ESP)
+    socket_message_FSUploadStartResponse handleUploadStart(const socket_message_FSUploadStartRequest& req);
+    socket_message_FSUploadChunkResponse handleUploadChunk(const socket_message_FSUploadChunkRequest& req);
+
+    // Cancel transfer
+    socket_message_FSCancelTransferResponse handleCancelTransfer(const socket_message_FSCancelTransferRequest& req);
+
+    // Cleanup expired transfers
+    void cleanupExpiredTransfers();
+
+  private:
+    std::map<std::string, TransferState> transfers_;
+    uint32_t transferIdCounter_;
+
+    std::string generateTransferId();
+    void listDirectory(const std::string& path, socket_message_FSListResponse& response);
+    bool deleteRecursive(const std::string& path);
+};
+
+extern FileSystemHandler fsHandler;
+
+} // namespace FileSystemWS

esp32/src/filesystem_ws.cpp

@@ -0,0 +1,364 @@
+#include <filesystem_ws.h>
+#include <filesystem.h>
+#include <pb_encode.h>
+#include <pb_decode.h>
+
+static const char* TAG = "FileSystemWS";
+
+namespace FileSystemWS {
+
+FileSystemHandler fsHandler;
+
+FileSystemHandler::FileSystemHandler() : transferIdCounter_(0) {}
+
+std::string FileSystemHandler::generateTransferId() {
+    return "xfer_" + std::to_string(millis()) + "_" + std::to_string(++transferIdCounter_);
+}
+
+void FileSystemHandler::cleanupExpiredTransfers() {
+    uint32_t now = millis();
+    auto it = transfers_.begin();
+    while (it != transfers_.end()) {
+        if (now - it->second.lastActivityTime > FS_TRANSFER_TIMEOUT) {
+            if (it->second.file) {
+                it->second.file.close();
+            }
+            ESP_LOGW(TAG, "Transfer %s timed out", it->first.c_str());
+            it = transfers_.erase(it);
+        } else {
+            ++it;
+        }
+    }
+}
+
+socket_message_FSDeleteResponse FileSystemHandler::handleDelete(const socket_message_FSDeleteRequest& req) {
+    socket_message_FSDeleteResponse response = socket_message_FSDeleteResponse_init_zero;
+
+    std::string path(req.path);
+    ESP_LOGI(TAG, "Delete request: %s", path.c_str());
+
+    if (!ESP_FS.exists(path.c_str())) {
+        response.success = false;
+        strncpy(response.error, "File or directory not found", sizeof(response.error) - 1);
+        return response;
+    }
+
+    if (deleteRecursive(path)) {
+        response.success = true;
+    } else {
+        response.success = false;
+        strncpy(response.error, "Failed to delete", sizeof(response.error) - 1);
+    }
+
+    return response;
+}
+
+bool FileSystemHandler::deleteRecursive(const std::string& path) {
+    File file = ESP_FS.open(path.c_str());
+    if (!file) return false;
+
+    if (file.isDirectory()) {
+        File child = file.openNextFile();
+        while (child) {
+            std::string childPath = std::string(child.name());
+            child.close();
+            if (!deleteRecursive(childPath)) {
+                file.close();
+                return false;
+            }
+            child = file.openNextFile();
+        }
+        file.close();
+        return ESP_FS.rmdir(path.c_str());
+    } else {
+        file.close();
+        return ESP_FS.remove(path.c_str());
+    }
+}
+
+socket_message_FSMkdirResponse FileSystemHandler::handleMkdir(const socket_message_FSMkdirRequest& req) {
+    socket_message_FSMkdirResponse response = socket_message_FSMkdirResponse_init_zero;
+
+    std::string path(req.path);
+    ESP_LOGI(TAG, "Mkdir request: %s", path.c_str());
+
+    if (ESP_FS.exists(path.c_str())) {
+        response.success = false;
+        strncpy(response.error, "Path already exists", sizeof(response.error) - 1);
+        return response;
+    }
+
+    if (ESP_FS.mkdir(path.c_str())) {
+        response.success = true;
+    } else {
+        response.success = false;
+        strncpy(response.error, "Failed to create directory", sizeof(response.error) - 1);
+    }
+
+    return response;
+}
+
+void FileSystemHandler::listDirectory(const std::string& path, socket_message_FSListResponse& response) {
+    File dir = ESP_FS.open(path.c_str());
+    if (!dir || !dir.isDirectory()) {
+        return;
+    }
+
+    File file = dir.openNextFile();
+    int fileCount = 0;
+    int dirCount = 0;
+
+    while (file && fileCount < 50 && dirCount < 50) {  // Limit to prevent overflow
+        if (file.isDirectory()) {
+            if (dirCount < 50) {
+                strncpy(response.directories[dirCount].name, file.name(), sizeof(response.directories[dirCount].name) - 1);
+                dirCount++;
+            }
+        } else {
+            if (fileCount < 50) {
+                strncpy(response.files[fileCount].name, file.name(), sizeof(response.files[fileCount].name) - 1);
+                response.files[fileCount].size = file.size();
+                fileCount++;
+            }
+        }
+        file = dir.openNextFile();
+    }
+
+    response.files_count = fileCount;
+    response.directories_count = dirCount;
+}
+
+socket_message_FSListResponse FileSystemHandler::handleList(const socket_message_FSListRequest& req) {
+    socket_message_FSListResponse response = socket_message_FSListResponse_init_zero;
+
+    std::string path(req.path);
+    if (path.empty()) path = "/";
+
+    ESP_LOGI(TAG, "List request: %s", path.c_str());
+
+    if (!ESP_FS.exists(path.c_str())) {
+        response.success = false;
+        strncpy(response.error, "Path not found", sizeof(response.error) - 1);
+        return response;
+    }
+
+    listDirectory(path, response);
+    response.success = true;
+
+    return response;
+}
+
+socket_message_FSDownloadStartResponse FileSystemHandler::handleDownloadStart(const socket_message_FSDownloadStartRequest& req) {
+    socket_message_FSDownloadStartResponse response = socket_message_FSDownloadStartResponse_init_zero;
+
+    std::string path(req.path);
+    ESP_LOGI(TAG, "Download start request: %s", path.c_str());
+
+    if (!ESP_FS.exists(path.c_str())) {
+        response.success = false;
+        strncpy(response.error, "File not found", sizeof(response.error) - 1);
+        return response;
+    }
+
+    File file = ESP_FS.open(path.c_str(), "r");
+    if (!file || file.isDirectory()) {
+        response.success = false;
+        strncpy(response.error, "Cannot open file for reading", sizeof(response.error) - 1);
+        return response;
+    }
+
+    uint32_t fileSize = file.size();
+    uint32_t chunkSize = FS_MAX_CHUNK_SIZE;
+    uint32_t totalChunks = (fileSize + chunkSize - 1) / chunkSize;
+
+    std::string transferId = generateTransferId();
+
+    TransferState state;
+    state.path = path;
+    state.file = file;
+    state.fileSize = fileSize;
+    state.chunkSize = chunkSize;
+    state.totalChunks = totalChunks;
+    state.chunksProcessed = 0;
+    state.lastActivityTime = millis();
+    state.isUpload = false;
+
+    transfers_[transferId] = state;
+
+    response.success = true;
+    response.file_size = fileSize;
+    response.chunk_size = chunkSize;
+    response.total_chunks = totalChunks;
+    strncpy(response.transfer_id, transferId.c_str(), sizeof(response.transfer_id) - 1);
+
+    ESP_LOGI(TAG, "Download started: %s, size=%u, chunks=%u, id=%s", path.c_str(), fileSize, totalChunks, transferId.c_str());
+
+    return response;
+}
+
+socket_message_FSDownloadChunkResponse FileSystemHandler::handleDownloadChunk(const socket_message_FSDownloadChunkRequest& req) {
+    socket_message_FSDownloadChunkResponse response = socket_message_FSDownloadChunkResponse_init_zero;
+
+    std::string transferId(req.transfer_id);
+    strncpy(response.transfer_id, transferId.c_str(), sizeof(response.transfer_id) - 1);
+    response.chunk_index = req.chunk_index;
+
+    auto it = transfers_.find(transferId);
+    if (it == transfers_.end()) {
+        strncpy(response.error, "Invalid transfer ID", sizeof(response.error) - 1);
+        return response;
+    }
+
+    TransferState& state = it->second;
+    state.lastActivityTime = millis();
+
+    // Seek to chunk position
+    uint32_t position = req.chunk_index * state.chunkSize;
+    if (!state.file.seek(position)) {
+        strncpy(response.error, "Failed to seek file", sizeof(response.error) - 1);
+        return response;
+    }
+
+    // Calculate chunk size (last chunk might be smaller)
+    uint32_t bytesToRead = state.chunkSize;
+    if (req.chunk_index == state.totalChunks - 1) {
+        bytesToRead = state.fileSize - position;
+    }
+
+    // Read chunk data
+    size_t bytesRead = state.file.read(response.data.bytes, bytesToRead);
+    response.data.size = bytesRead;
+
+    response.is_last = (req.chunk_index == state.totalChunks - 1);
+
+    ESP_LOGI(TAG, "Download chunk %u/%u: %u bytes", req.chunk_index + 1, state.totalChunks, bytesRead);
+
+    // Cleanup if last chunk
+    if (response.is_last) {
+        state.file.close();
+        transfers_.erase(it);
+        ESP_LOGI(TAG, "Download completed: %s", transferId.c_str());
+    }
+
+    return response;
+}
+
+socket_message_FSUploadStartResponse FileSystemHandler::handleUploadStart(const socket_message_FSUploadStartRequest& req) {
+    socket_message_FSUploadStartResponse response = socket_message_FSUploadStartResponse_init_zero;
+
+    std::string path(req.path);
+    ESP_LOGI(TAG, "Upload start request: %s, size=%u", path.c_str(), req.file_size);
+
+    // Ensure parent directory exists
+    size_t lastSlash = path.find_last_of('/');
+    if (lastSlash != std::string::npos && lastSlash > 0) {
+        std::string parentDir = path.substr(0, lastSlash);
+        if (!ESP_FS.exists(parentDir.c_str())) {
+            response.success = false;
+            strncpy(response.error, "Parent directory does not exist", sizeof(response.error) - 1);
+            return response;
+        }
+    }
+
+    File file = ESP_FS.open(path.c_str(), FILE_WRITE);
+    if (!file) {
+        response.success = false;
+        strncpy(response.error, "Cannot open file for writing", sizeof(response.error) - 1);
+        return response;
+    }
+
+    std::string transferId = generateTransferId();
+
+    TransferState state;
+    state.path = path;
+    state.file = file;
+    state.fileSize = req.file_size;
+    state.chunkSize = req.chunk_size > FS_MAX_CHUNK_SIZE ? FS_MAX_CHUNK_SIZE : req.chunk_size;
+    state.totalChunks = (req.file_size + state.chunkSize - 1) / state.chunkSize;
+    state.chunksProcessed = 0;
+    state.lastActivityTime = millis();
+    state.isUpload = true;
+
+    transfers_[transferId] = state;
+
+    response.success = true;
+    response.max_chunk_size = FS_MAX_CHUNK_SIZE;
+    strncpy(response.transfer_id, transferId.c_str(), sizeof(response.transfer_id) - 1);
+
+    ESP_LOGI(TAG, "Upload started: %s, id=%s", path.c_str(), transferId.c_str());
+
+    return response;
+}
+
+socket_message_FSUploadChunkResponse FileSystemHandler::handleUploadChunk(const socket_message_FSUploadChunkRequest& req) {
+    socket_message_FSUploadChunkResponse response = socket_message_FSUploadChunkResponse_init_zero;
+
+    std::string transferId(req.transfer_id);
+    strncpy(response.transfer_id, transferId.c_str(), sizeof(response.transfer_id) - 1);
+    response.chunk_index = req.chunk_index;
+
+    auto it = transfers_.find(transferId);
+    if (it == transfers_.end()) {
+        response.success = false;
+        strncpy(response.error, "Invalid transfer ID", sizeof(response.error) - 1);
+        return response;
+    }
+
+    TransferState& state = it->second;
+    state.lastActivityTime = millis();
+
+    // Write chunk data
+    size_t bytesWritten = state.file.write(req.data.bytes, req.data.size);
+    if (bytesWritten != req.data.size) {
+        response.success = false;
+        strncpy(response.error, "Failed to write chunk", sizeof(response.error) - 1);
+        state.file.close();
+        transfers_.erase(it);
+        return response;
+    }
+
+    state.chunksProcessed++;
+    response.success = true;
+    response.transfer_complete = req.is_last;
+
+    ESP_LOGI(TAG, "Upload chunk %u/%u: %u bytes", state.chunksProcessed, state.totalChunks, bytesWritten);
+
+    // Cleanup if last chunk
+    if (req.is_last) {
+        state.file.close();
+        transfers_.erase(it);
+        ESP_LOGI(TAG, "Upload completed: %s", state.path.c_str());
+    }
+
+    return response;
+}
+
+socket_message_FSCancelTransferResponse FileSystemHandler::handleCancelTransfer(const socket_message_FSCancelTransferRequest& req) {
+    socket_message_FSCancelTransferResponse response = socket_message_FSCancelTransferResponse_init_zero;
+
+    std::string transferId(req.transfer_id);
+    auto it = transfers_.find(transferId);
+
+    if (it == transfers_.end()) {
+        response.success = false;
+        return response;
+    }
+
+    if (it->second.file) {
+        it->second.file.close();
+    }
+
+    // Delete partial upload file
+    if (it->second.isUpload) {
+        ESP_FS.remove(it->second.path.c_str());
+    }
+
+    transfers_.erase(it);
+    response.success = true;
+
+    ESP_LOGI(TAG, "Transfer cancelled: %s", transferId.c_str());
+
+    return response;
+}
+
+} // namespace FileSystemWS

platform_shared/message.proto

@@ -11,28 +11,112 @@ message KnownNetworkItem { string ssid = 1; string password = 2; bool static_ip
 
 // ----- FILESYSTEM -----
 
-message File { string name = 10; } // Add permissions?
+message File {
+    string name = 10;
+    uint32 size = 20;
+}
+
 message Directory {
     string name = 10;
     repeated File files = 20;
     repeated Directory directories = 30;
 }
-enum FileRequestOptions {
-    DELETE = 0;
-    EDIT = 1;
-    MKDIR = 2;
-    GET = 3;
-    POST = 4;
 
-    START_UPLOAD = 10;
+// Delete a file or directory
+message FSDeleteRequest {
+    string path = 1;
 }
 
-message FSDelete { string path = 1; }
+message FSDeleteResponse {
+    bool success = 1;
+    string error = 2;
+}
 
-message FilesystemRequest {
-    oneof type {
-        
-    }
+// Create directory
+message FSMkdirRequest {
+    string path = 1;
+}
+
+message FSMkdirResponse {
+    bool success = 1;
+    string error = 2;
+}
+
+// List files/directories
+message FSListRequest {
+    string path = 1;
+}
+
+message FSListResponse {
+    bool success = 1;
+    string error = 2;
+    repeated File files = 3;
+    repeated Directory directories = 4;
+}
+
+// Download from ESP (ESP -> Client)
+message FSDownloadStartRequest {
+    string path = 1;  // File path on ESP to download
+}
+
+message FSDownloadStartResponse {
+    bool success = 1;
+    string error = 2;
+    uint32 file_size = 3;      // Total file size in bytes
+    uint32 chunk_size = 4;     // Size of each chunk (max 1024)
+    uint32 total_chunks = 5;   // Total number of chunks
+    string transfer_id = 6;    // Unique ID for this transfer
+}
+
+message FSDownloadChunkRequest {
+    string transfer_id = 1;
+    uint32 chunk_index = 2;    // Which chunk to request (0-based)
+}
+
+message FSDownloadChunkResponse {
+    string transfer_id = 1;
+    uint32 chunk_index = 2;
+    bytes data = 3;            // Chunk data (max 1024 bytes)
+    bool is_last = 4;          // True if this is the last chunk
+    string error = 5;
+}
+
+// Upload to ESP (Client -> ESP)
+message FSUploadStartRequest {
+    string path = 1;           // Destination path on ESP
+    uint32 file_size = 2;      // Total file size in bytes
+    uint32 chunk_size = 3;     // Size of each chunk (max 1024)
+}
+
+message FSUploadStartResponse {
+    bool success = 1;
+    string error = 2;
+    string transfer_id = 3;    // Unique ID for this transfer
+    uint32 max_chunk_size = 4; // Server's max chunk size (1024)
+}
+
+message FSUploadChunkRequest {
+    string transfer_id = 1;
+    uint32 chunk_index = 2;    // Which chunk this is (0-based)
+    bytes data = 3;            // Chunk data (max 1024 bytes)
+    bool is_last = 4;          // True if this is the last chunk
+}
+
+message FSUploadChunkResponse {
+    string transfer_id = 1;
+    uint32 chunk_index = 2;
+    bool success = 3;
+    string error = 4;
+    bool transfer_complete = 5; // True when all chunks received
+}
+
+// Cancel transfer
+message FSCancelTransferRequest {
+    string transfer_id = 1;
+}
+
+message FSCancelTransferResponse {
+    bool success = 1;
 }
 
 // ----- FILESYSTEM -----
@@ -83,6 +167,14 @@ message CorrelationRequest {
         I2CScanDataRequest i2c_scan_data_request = 20;
         IMUCalibrateExecute imu_calibrate_execute = 30;
         SystemInformationRequest system_information_request = 40;
+        FSDeleteRequest fs_delete_request = 50;
+        FSMkdirRequest fs_mkdir_request = 60;
+        FSListRequest fs_list_request = 70;
+        FSDownloadStartRequest fs_download_start_request = 80;
+        FSDownloadChunkRequest fs_download_chunk_request = 90;
+        FSUploadStartRequest fs_upload_start_request = 100;
+        FSUploadChunkRequest fs_upload_chunk_request = 110;
+        FSCancelTransferRequest fs_cancel_transfer_request = 120;
     }
 }
 
@@ -94,6 +186,14 @@ message CorrelationResponse {
         I2CScanData i2c_scan_data = 20;
         IMUCalibrateData imu_calibrate_data = 30;
         SystemInformationResponse system_information_response = 40;
+        FSDeleteResponse fs_delete_response = 50;
+        FSMkdirResponse fs_mkdir_response = 60;
+        FSListResponse fs_list_response = 70;
+        FSDownloadStartResponse fs_download_start_response = 80;
+        FSDownloadChunkResponse fs_download_chunk_response = 90;
+        FSUploadStartResponse fs_upload_start_response = 100;
+        FSUploadChunkResponse fs_upload_chunk_response = 110;
+        FSCancelTransferResponse fs_cancel_transfer_response = 120;
     }
 }