diff --git a/app/src/routes/peripherals/i2c/i2cSetting.svelte b/app/src/routes/peripherals/i2c/i2cSetting.svelte
index 4849e2a..21561f3 100644
--- a/app/src/routes/peripherals/i2c/i2cSetting.svelte
+++ b/app/src/routes/peripherals/i2c/i2cSetting.svelte
@@ -1,25 +1,31 @@
 <script lang="ts">
     import { Cancel, Edit, EditOff, Power } from '$lib/components/icons'
-    import { socket } from '$lib/stores'
+    import { api } from '$lib/api'
     import { onMount } from 'svelte'
     import { modals } from 'svelte-modals'
     import ConfirmDialog from '$lib/components/ConfirmDialog.svelte'
     import {
-        PeripheralSettingsData,
-        PeripheralSettingsDataRequest
-    } from '$lib/platform_shared/message'
+        type PeripheralSettings,
+        Request,
+        type Response as ProtoResponse
+    } from '$lib/platform_shared/api'
 
-    let settings: PeripheralSettingsData | null = $state(null)
+    let settings = $state<PeripheralSettings | null>(null)
     let isEditing = $state(false)
 
     onMount(() => {
-        let unsub = socket.on(PeripheralSettingsData, handleSettings)
-        socket.emit(PeripheralSettingsDataRequest, {})
-        return unsub
+        getPeripheralSettings()
     })
 
-    const handleSettings = (data: PeripheralSettingsData) => {
-        settings = data
+    const getPeripheralSettings = async () => {
+        const result = await api.get<ProtoResponse>('/api/peripherals/settings')
+        if (result.isErr()) {
+            console.error('Error:', result.inner)
+            return
+        }
+        if (result.inner.peripheralSettings) {
+            settings = result.inner.peripheralSettings
+        }
     }
 
     const handleSave = () => {
@@ -31,9 +37,21 @@
                 cancel: { label: 'Cancel', icon: Cancel },
                 confirm: { label: 'Confirm', icon: Power }
             },
-            onConfirm: () => {
+            onConfirm: async () => {
                 modals.close()
-                socket.emit(PeripheralSettingsData, settings)
+                if (!settings) return
+                const request = Request.create({
+                    peripheralSettings: settings
+                })
+                const result = await api.post_proto<ProtoResponse>('/api/peripherals/settings', request)
+                if (result.isErr()) {
+                    console.error('Error:', result.inner)
+                    return
+                }
+                if (result.inner.peripheralSettings) {
+                    settings = result.inner.peripheralSettings
+                }
+                isEditing = false
             }
         })
     }
diff --git a/esp32/include/peripherals/peripherals.h b/esp32/include/peripherals/peripherals.h
index f4c88b5..28b0efd 100644
--- a/esp32/include/peripherals/peripherals.h
+++ b/esp32/include/peripherals/peripherals.h
@@ -1,15 +1,17 @@
 #pragma once
 
-#include <template/stateful_persistence.h>
+#include <template/stateful_persistence_pb.h>
 #include <template/stateful_service.h>
+#include <template/stateful_proto_endpoint.h>
 #include <utils/math_utils.h>
 #include <utils/timing.h>
 #include <filesystem.h>
 #include <features.h>
 #include <settings/peripherals_settings.h>
-#include <template/stateful_endpoint.h>
 #include <platform_shared/message.pb.h>
 
+#define PERIPHERAL_SETTINGS_FILE "/config/peripheralSettings.pb"
+
 #include <list>
 
 #include <NewPing.h>
@@ -64,10 +66,10 @@ class Peripherals : public StatefulService<PeripheralsConfiguration> {
 
     bool calibrateIMU();
 
-    StatefulHttpEndpoint<PeripheralsConfiguration> endpoint;
+    StatefulProtoEndpoint<PeripheralsConfiguration, api_PeripheralSettings> protoEndpoint;
 
   private:
-    FSPersistence<PeripheralsConfiguration> _persistence;
+    FSPersistencePB<PeripheralsConfiguration> _persistence;
 
     SemaphoreHandle_t _accessMutex;
     inline void beginTransaction() { xSemaphoreTakeRecursive(_accessMutex, portMAX_DELAY); }
diff --git a/esp32/include/settings/peripherals_settings.h b/esp32/include/settings/peripherals_settings.h
index 6947b7a..6f016b0 100644
--- a/esp32/include/settings/peripherals_settings.h
+++ b/esp32/include/settings/peripherals_settings.h
@@ -1,9 +1,7 @@
 #pragma once
 
-#include <vector>
-#include <ArduinoJson.h>
 #include <template/state_result.h>
-#include <string>
+#include <platform_shared/api.pb.h>
 
 /*
  * I2C software connection
@@ -18,33 +16,26 @@
 #define I2C_FREQUENCY 1000000UL
 #endif
 
-class PinConfig {
-  public:
-    int pin;
-    std::string mode;
-    std::string type;
-    std::string role;
+// Use proto types directly
+using PinConfig = api_PinConfig;
+using PeripheralsConfiguration = api_PeripheralSettings;
 
-    PinConfig(int p, std::string m, std::string t, std::string r) : pin(p), mode(m), type(t), role(r) {}
-};
+// Default factory settings
+inline PeripheralsConfiguration PeripheralsConfiguration_defaults() {
+    PeripheralsConfiguration settings = api_PeripheralSettings_init_zero;
+    settings.sda = SDA_PIN;
+    settings.scl = SCL_PIN;
+    settings.frequency = I2C_FREQUENCY;
+    settings.pins_count = 0;
+    return settings;
+}
 
-class PeripheralsConfiguration {
-  public:
-    int sda = SDA_PIN;
-    int scl = SCL_PIN;
-    long frequency = I2C_FREQUENCY;
-    std::vector<PinConfig> pins;
+// Proto read/update are identity functions since type is the same
+inline void PeripheralsConfiguration_read(const PeripheralsConfiguration& settings, PeripheralsConfiguration& proto) {
+    proto = settings;
+}
 
-    static void read(PeripheralsConfiguration &settings, JsonVariant &root) {
-        root["sda"] = settings.sda;
-        root["scl"] = settings.scl;
-        root["frequency"] = settings.frequency;
-    }
-
-    static StateUpdateResult update(JsonVariant &root, PeripheralsConfiguration &settings) {
-        settings.sda = root["sda"] | SDA_PIN;
-        settings.scl = root["scl"] | SCL_PIN;
-        settings.frequency = root["frequency"] | I2C_FREQUENCY;
-        return StateUpdateResult::CHANGED;
-    };
-};
\ No newline at end of file
+inline StateUpdateResult PeripheralsConfiguration_update(const PeripheralsConfiguration& proto, PeripheralsConfiguration& settings) {
+    settings = proto;
+    return StateUpdateResult::CHANGED;
+}
\ No newline at end of file
diff --git a/esp32/src/main.cpp b/esp32/src/main.cpp
index e7a8b54..3c10101 100644
--- a/esp32/src/main.cpp
+++ b/esp32/src/main.cpp
@@ -82,12 +82,12 @@ void setupServer() {
                              return apService.protoEndpoint.handleStateUpdate(request, protoReq);
                          });
     
-    // TODO: REMAKE TO PROTO - note: these are unused?
-    server.on("/api/peripherals", HTTP_GET,
-              [&](httpd_req_t *request) { return peripherals.endpoint.getState(request); });
-    server.on("/api/peripherals", HTTP_POST, [&](httpd_req_t *request, JsonVariant &json) {
-        return peripherals.endpoint.handleStateUpdate(request, json);
-    });
+    server.on("/api/peripherals/settings", HTTP_GET,
+              [&](httpd_req_t *request) { return peripherals.protoEndpoint.getState(request); });
+    server.onProto("/api/peripherals/settings", HTTP_POST,
+                   [&](httpd_req_t *request, api_Request *protoReq) {
+                       return peripherals.protoEndpoint.handleStateUpdate(request, protoReq);
+                   });
 
 #if FT_ENABLED(USE_MDNS)
     server.on("/api/mdns/settings", HTTP_GET, [&](httpd_req_t *request) { return mdnsService.protoEndpoint.getState(request); });
diff --git a/esp32/src/peripherals/peripherals.cpp b/esp32/src/peripherals/peripherals.cpp
index 53df6ea..06b0d0b 100644
--- a/esp32/src/peripherals/peripherals.cpp
+++ b/esp32/src/peripherals/peripherals.cpp
@@ -1,8 +1,12 @@
 #include <peripherals/peripherals.h>
 
 Peripherals::Peripherals()
-    : endpoint(PeripheralsConfiguration::read, PeripheralsConfiguration::update, this),
-      _persistence(PeripheralsConfiguration::read, PeripheralsConfiguration::update, this, DEVICE_CONFIG_FILE) {
+    : protoEndpoint(PeripheralsConfiguration_read, PeripheralsConfiguration_update, this,
+                    API_REQUEST_EXTRACTOR(peripheral_settings, api_PeripheralSettings),
+                    API_RESPONSE_ASSIGNER(peripheral_settings, api_PeripheralSettings)),
+      _persistence(PeripheralsConfiguration_read, PeripheralsConfiguration_update, this,
+                   PERIPHERAL_SETTINGS_FILE, api_PeripheralSettings_fields, api_PeripheralSettings_size,
+                   PeripheralsConfiguration_defaults()) {
     _accessMutex = xSemaphoreCreateMutex();
     addUpdateHandler([&](const std::string &originId) { updatePins(); }, false);
 }
diff --git a/platform_shared/api.options b/platform_shared/api.options
index 5ad07c6..371e076 100644
--- a/platform_shared/api.options
+++ b/platform_shared/api.options
@@ -48,3 +48,9 @@ api.MDNSQueryResult.name max_size:64
 api.MDNSQueryResult.ip max_size:46
 
 api.MDNSQueryResponse.services max_count:16
+
+api.PinConfig.mode max_size:16
+api.PinConfig.type max_size:16
+api.PinConfig.role max_size:16
+
+api.PeripheralSettings.pins max_count:32
diff --git a/platform_shared/api.proto b/platform_shared/api.proto
index eb4fee5..e479844 100644
--- a/platform_shared/api.proto
+++ b/platform_shared/api.proto
@@ -174,6 +174,26 @@ message MDNSQueryResponse {
     repeated MDNSQueryResult services = 1;
 }
 
+// =============================================================================
+// Peripheral Settings - I2C configuration
+// =============================================================================
+
+message PinConfig {
+    int32 pin = 1;
+    string mode = 2;
+    string type = 3;
+    string role = 4;
+}
+
+message PeripheralSettings {
+    int32 sda = 1;
+    int32 scl = 2;
+    int32 frequency = 3;
+    repeated PinConfig pins = 4;
+}
+
+message PeripheralSettingsRequest {}
+
 // =============================================================================
 // File System - shared data types
 // =============================================================================
@@ -228,6 +248,8 @@ message Request {
         MDNSSettingsRequest mdns_settings_request = 61;
         MDNSStatusRequest mdns_status_request = 62;
         MDNSQueryRequest mdns_query_request = 63;
+        PeripheralSettings peripheral_settings = 70;
+        PeripheralSettingsRequest peripheral_settings_request = 71;
     }
 }
 
@@ -247,5 +269,6 @@ message Response {
         MDNSSettings mdns_settings = 60;
         MDNSStatus mdns_status = 61;
         MDNSQueryResponse mdns_query_response = 62;
+        PeripheralSettings peripheral_settings = 70;
     }
 }