From 72e2522dcd845e68a57b0bece48bdaf2acacf6c2 Mon Sep 17 00:00:00 2001
From: Niklas Jensen <niklaspj2004@gmail.com>
Date: Fri, 30 Jan 2026 14:56:15 +0100
Subject: [PATCH] Updated mdns to use protobufs (completely untested)

---
 app/src/lib/types/models.ts            |  29 -----
 app/src/routes/wifi/mdns/MDNS.svelte   |  31 +++--
 esp32/include/filesystem.h             |   5 -
 esp32/include/mdns_service.h           |  16 ++-
 esp32/include/settings/mdns_settings.h | 155 ++++++-------------------
 esp32/src/main.cpp                     |  18 +--
 esp32/src/mdns_service.cpp             | 105 ++++++++++-------
 platform_shared/api.options            |  25 ++++
 platform_shared/api.proto              |  56 +++++++++
 9 files changed, 221 insertions(+), 219 deletions(-)

diff --git a/app/src/lib/types/models.ts b/app/src/lib/types/models.ts
index 04617c9..614f29e 100644
--- a/app/src/lib/types/models.ts
+++ b/app/src/lib/types/models.ts
@@ -91,35 +91,6 @@ export type ServoConfiguration = {
     servos: Servo[]
 }
 
-export interface MDNSServiceQuery {
-    services: MDNSServiceItem[]
-}
-
-export interface MDNSServiceItem {
-    ip: string
-    port: number
-    name: string
-}
-
-export interface MDNSService {
-    service: string
-    protocol: string
-    port: number
-}
-
-export interface MDNSTxtRecord {
-    key: string
-    value: string
-}
-
-export interface MDNSStatus {
-    started: boolean
-    hostname: string
-    instance: string
-    services: MDNSService[]
-    global_txt_records: MDNSTxtRecord[]
-}
-
 export interface Result {
     success: boolean
     error?: string
diff --git a/app/src/routes/wifi/mdns/MDNS.svelte b/app/src/routes/wifi/mdns/MDNS.svelte
index 899a1f6..ff16a18 100644
--- a/app/src/routes/wifi/mdns/MDNS.svelte
+++ b/app/src/routes/wifi/mdns/MDNS.svelte
@@ -6,33 +6,46 @@
     import StatusItem from '$lib/components/StatusItem.svelte'
     import { cubicOut } from 'svelte/easing'
     import { slide } from 'svelte/transition'
-    import type { MDNSStatus, MDNSServiceItem, MDNSServiceQuery } from '$lib/types/models'
+    import {
+        type MDNSStatus,
+        type MDNSQueryResult,
+        Request,
+        type Response as ProtoResponse
+    } from '$lib/platform_shared/api'
     import { compareIp } from '$lib/utilities'
 
-    let mdnsStatus: MDNSStatus | undefined = $state()
-    let services: MDNSServiceItem[] = $state([])
+    let mdnsStatus = $state<MDNSStatus | undefined>()
+    let services = $state<MDNSQueryResult[]>([])
     let isLoading = $state(false)
 
     const getMDNSStatus = async () => {
-        const result = await api.get<MDNSStatus>('/api/mdns/status')
+        const result = await api.get<ProtoResponse>('/api/mdns/status')
         if (result.isErr()) {
             console.error('Error:', result.inner)
             return
         }
-        mdnsStatus = result.inner
+        if (result.inner.mdnsStatus) {
+            mdnsStatus = result.inner.mdnsStatus
+        }
     }
 
     const queryMDNSServices = async () => {
         isLoading = true
-        const result = await api.post<MDNSServiceQuery>('/api/mdns/query', {
-            service: 'http',
-            protocol: 'tcp'
+        const request = Request.create({
+            mdnsQueryRequest: {
+                service: 'http',
+                protocol: 'tcp'
+            }
         })
+        const result = await api.post_proto<ProtoResponse>('/api/mdns/query', request)
         if (result.isErr()) {
             console.error('Error:', result.inner)
+            isLoading = false
             return
         }
-        services = result.inner.services.sort((a, b) => compareIp(a.ip, b.ip))
+        if (result.inner.mdnsQueryResponse) {
+            services = result.inner.mdnsQueryResponse.services.sort((a, b) => compareIp(a.ip, b.ip))
+        }
         isLoading = false
     }
 
diff --git a/esp32/include/filesystem.h b/esp32/include/filesystem.h
index cfc7650..140801a 100644
--- a/esp32/include/filesystem.h
+++ b/esp32/include/filesystem.h
@@ -8,13 +8,8 @@
 
 #define ESP_FS LittleFS
 
-#define AP_SETTINGS_FILE "/config/apSettings.json"
-#define CAMERA_SETTINGS_FILE "/config/cameraSettings.json"
 #define FS_CONFIG_DIRECTORY "/config"
 #define DEVICE_CONFIG_FILE "/config/peripheral.json"
-#define WIFI_SETTINGS_FILE "/config/wifiSettings.json"
-#define SERVO_SETTINGS_FILE "/config/servoSettings.json"
-#define MDNS_SETTINGS_FILE "/config/mdnsSettings.json"
 
 namespace FileSystem {
 
diff --git a/esp32/include/mdns_service.h b/esp32/include/mdns_service.h
index 8f49e91..d8d4c54 100644
--- a/esp32/include/mdns_service.h
+++ b/esp32/include/mdns_service.h
@@ -1,18 +1,18 @@
 #pragma once
 
 #include <esp_http_server.h>
-#include <ArduinoJson.h>
 #include <ESPmDNS.h>
 #include <template/stateful_service.h>
-#include <template/stateful_endpoint.h>
-#include <template/stateful_persistence.h>
+#include <template/stateful_proto_endpoint.h>
+#include <template/stateful_persistence_pb.h>
 #include <settings/mdns_settings.h>
 #include <utils/timing.h>
-#include <string>
+
+#define MDNS_SETTINGS_FILE "/config/mdnsSettings.pb"
 
 class MDNSService : public StatefulService<MDNSSettings> {
   private:
-    FSPersistence<MDNSSettings> _persistence;
+    FSPersistencePB<MDNSSettings> _persistence;
     bool _started {false};
 
     void reconfigureMDNS();
@@ -27,9 +27,7 @@ class MDNSService : public StatefulService<MDNSSettings> {
     void begin();
 
     esp_err_t getStatus(httpd_req_t *request);
-    void getStatus(JsonVariant &root);
+    esp_err_t queryServices(httpd_req_t *request, api_Request *protoReq);
 
-    static esp_err_t queryServices(httpd_req_t *request, JsonVariant &json);
-
-    StatefulHttpEndpoint<MDNSSettings> endpoint;
+    StatefulProtoEndpoint<MDNSSettings, api_MDNSSettings> protoEndpoint;
 };
diff --git a/esp32/include/settings/mdns_settings.h b/esp32/include/settings/mdns_settings.h
index 3bb338a..5f82e60 100644
--- a/esp32/include/settings/mdns_settings.h
+++ b/esp32/include/settings/mdns_settings.h
@@ -1,9 +1,9 @@
 #pragma once
 
-#include <ArduinoJson.h>
 #include <template/state_result.h>
-#include <filesystem.h>
+#include <platform_shared/api.pb.h>
 #include <string>
+#include <cstring>
 
 #ifndef FACTORY_MDNS_HOSTNAME
 #define FACTORY_MDNS_HOSTNAME "esp32"
@@ -13,126 +13,45 @@
 #define FACTORY_MDNS_INSTANCE "ESP32 Device"
 #endif
 
-typedef struct {
-    std::string key;
-    std::string value;
+// Use proto types directly
+using MDNSTxtRecord = api_MDNSTxtRecord;
+using MDNSServiceDef = api_MDNSServiceDef;
+using MDNSSettings = api_MDNSSettings;
+using MDNSStatus = api_MDNSStatus;
 
-    void serialize(JsonVariant &json) const {
-        json["key"] = key.c_str();
-        json["value"] = value.c_str();
-    }
+// Default factory settings
+inline MDNSSettings MDNSSettings_defaults() {
+    MDNSSettings settings = api_MDNSSettings_init_zero;
+    strncpy(settings.hostname, FACTORY_MDNS_HOSTNAME, sizeof(settings.hostname) - 1);
+    strncpy(settings.instance, FACTORY_MDNS_INSTANCE, sizeof(settings.instance) - 1);
 
-    bool deserialize(const JsonVariant &json) {
-        key = json["key"].as<std::string>();
-        value = json["value"].as<std::string>();
+    // Default HTTP service
+    settings.services_count = 2;
+    strncpy(settings.services[0].service, "http", sizeof(settings.services[0].service) - 1);
+    strncpy(settings.services[0].protocol, "tcp", sizeof(settings.services[0].protocol) - 1);
+    settings.services[0].port = 80;
+    settings.services[0].txt_records_count = 0;
 
-        return key.length() > 0;
-    }
-} mdns_txt_record_t;
+    // Default WS service
+    strncpy(settings.services[1].service, "ws", sizeof(settings.services[1].service) - 1);
+    strncpy(settings.services[1].protocol, "tcp", sizeof(settings.services[1].protocol) - 1);
+    settings.services[1].port = 80;
+    settings.services[1].txt_records_count = 0;
 
-typedef struct {
-    std::string service;
-    std::string protocol;
-    uint16_t port;
-    std::vector<mdns_txt_record_t> txtRecords;
+    // Default global txt record
+    settings.global_txt_records_count = 1;
+    strncpy(settings.global_txt_records[0].key, "Firmware Version", sizeof(settings.global_txt_records[0].key) - 1);
+    strncpy(settings.global_txt_records[0].value, APP_VERSION, sizeof(settings.global_txt_records[0].value) - 1);
 
-    void serialize(JsonVariant &json) const {
-        json["service"] = service.c_str();
-        json["protocol"] = protocol.c_str();
-        json["port"] = port;
+    return settings;
+}
 
-        if (txtRecords.size() > 0) {
-            JsonArray txtArray = json["txt_records"].to<JsonArray>();
-            for (const auto &txt : txtRecords) {
-                JsonVariant txtObj = txtArray.add<JsonVariant>();
-                txt.serialize(txtObj);
-            }
-        }
-    }
+// Proto read/update are identity functions since type is the same
+inline void MDNSSettings_read(const MDNSSettings& settings, MDNSSettings& proto) {
+    proto = settings;
+}
 
-    bool deserialize(const JsonVariant &json) {
-        service = json["service"].as<std::string>();
-        protocol = json["protocol"].as<std::string>();
-        port = json["port"] | 0;
-
-        txtRecords.clear();
-        if (json["txt_records"].is<JsonArray>()) {
-            JsonArray txtArray = json["txt_records"];
-            for (JsonVariant txtObj : txtArray) {
-                mdns_txt_record_t txt;
-                if (txt.deserialize(txtObj)) {
-                    txtRecords.push_back(txt);
-                }
-            }
-        }
-
-        return service.length() > 0 && protocol.length() > 0 && port > 0;
-    }
-} mdns_service_t;
-
-class MDNSSettings {
-  public:
-    std::string hostname;
-    std::string instance;
-    std::vector<mdns_service_t> services;
-    std::vector<mdns_txt_record_t> globalTxtRecords;
-
-    static void read(MDNSSettings &settings, JsonVariant &root) {
-        root["hostname"] = settings.hostname.c_str();
-        root["instance"] = settings.instance.c_str();
-
-        JsonArray servicesArray = root["services"].to<JsonArray>();
-        for (const auto &service : settings.services) {
-            JsonVariant serviceObj = servicesArray.add<JsonVariant>();
-            service.serialize(serviceObj);
-        }
-
-        JsonArray txtArray = root["global_txt_records"].to<JsonArray>();
-        for (const auto &txt : settings.globalTxtRecords) {
-            JsonVariant txtObj = txtArray.add<JsonVariant>();
-            txt.serialize(txtObj);
-        }
-    }
-
-    static StateUpdateResult update(JsonVariant &root, MDNSSettings &settings) {
-        settings.hostname = root["hostname"] | FACTORY_MDNS_HOSTNAME;
-        settings.instance = root["instance"] | FACTORY_MDNS_INSTANCE;
-
-        settings.services.clear();
-        if (root["services"].is<JsonArray>()) {
-            JsonArray servicesArray = root["services"];
-            for (JsonVariant serviceObj : servicesArray) {
-                mdns_service_t service;
-                if (service.deserialize(serviceObj)) {
-                    settings.services.push_back(service);
-                }
-            }
-        }
-
-        if (settings.services.empty()) {
-            mdns_service_t httpService = {.service = "http", .protocol = "tcp", .port = 80, .txtRecords = {}};
-            settings.services.push_back(httpService);
-
-            mdns_service_t wsService = {.service = "ws", .protocol = "tcp", .port = 80, .txtRecords = {}};
-            settings.services.push_back(wsService);
-        }
-
-        settings.globalTxtRecords.clear();
-        if (root["global_txt_records"].is<JsonArray>()) {
-            JsonArray txtArray = root["global_txt_records"];
-            for (JsonVariant txtObj : txtArray) {
-                mdns_txt_record_t txt;
-                if (txt.deserialize(txtObj)) {
-                    settings.globalTxtRecords.push_back(txt);
-                }
-            }
-        }
-
-        if (settings.globalTxtRecords.empty()) {
-            mdns_txt_record_t firmwareVersion = {.key = "Firmware Version", .value = APP_VERSION};
-            settings.globalTxtRecords.push_back(firmwareVersion);
-        }
-
-        return StateUpdateResult::CHANGED;
-    }
-};
\ No newline at end of file
+inline StateUpdateResult MDNSSettings_update(const MDNSSettings& proto, MDNSSettings& settings) {
+    settings = proto;
+    return StateUpdateResult::CHANGED;
+}
diff --git a/esp32/src/main.cpp b/esp32/src/main.cpp
index 1e47125..e7a8b54 100644
--- a/esp32/src/main.cpp
+++ b/esp32/src/main.cpp
@@ -82,7 +82,7 @@ void setupServer() {
                              return apService.protoEndpoint.handleStateUpdate(request, protoReq);
                          });
     
-    // TODO: REMAKE TO PROTO
+    // 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) {
@@ -90,14 +90,16 @@ void setupServer() {
     });
 
 #if FT_ENABLED(USE_MDNS)
-    // TODO: REMAKE TO PROTO
-    server.on("/api/mdns", HTTP_GET, [&](httpd_req_t *request) { return mdnsService.endpoint.getState(request); });
-    server.on("/api/mdns", HTTP_POST, [&](httpd_req_t *request, JsonVariant &json) {
-        return mdnsService.endpoint.handleStateUpdate(request, json);
-    });
+    server.on("/api/mdns/settings", HTTP_GET, [&](httpd_req_t *request) { return mdnsService.protoEndpoint.getState(request); });
+    server.onProto("/api/mdns/settings", HTTP_POST,
+                   [&](httpd_req_t *request, api_Request *protoReq) {
+                       return mdnsService.protoEndpoint.handleStateUpdate(request, protoReq);
+                   });
     server.on("/api/mdns/status", HTTP_GET, [&](httpd_req_t *request) { return mdnsService.getStatus(request); });
-    server.on("/api/mdns/query", HTTP_POST,
-              [&](httpd_req_t *request, JsonVariant &json) { return mdnsService.queryServices(request, json); });
+    server.onProto("/api/mdns/query", HTTP_POST,
+                   [&](httpd_req_t *request, api_Request *protoReq) {
+                       return mdnsService.queryServices(request, protoReq);
+                   });
 #endif
     
     server.on("/api/config/*", HTTP_GET, [](httpd_req_t *request) { return FileSystem::getConfigFile(request); });
diff --git a/esp32/src/mdns_service.cpp b/esp32/src/mdns_service.cpp
index 9ba269d..e508679 100644
--- a/esp32/src/mdns_service.cpp
+++ b/esp32/src/mdns_service.cpp
@@ -4,8 +4,12 @@
 static const char *TAG = "MDNSService";
 
 MDNSService::MDNSService()
-    : _persistence(MDNSSettings::read, MDNSSettings::update, this, MDNS_SETTINGS_FILE),
-      endpoint(MDNSSettings::read, MDNSSettings::update, this) {
+    : protoEndpoint(MDNSSettings_read, MDNSSettings_update, this,
+                    API_REQUEST_EXTRACTOR(mdns_settings, api_MDNSSettings),
+                    API_RESPONSE_ASSIGNER(mdns_settings, api_MDNSSettings)),
+      _persistence(MDNSSettings_read, MDNSSettings_update, this,
+                   MDNS_SETTINGS_FILE, api_MDNSSettings_fields, api_MDNSSettings_size,
+                   MDNSSettings_defaults()) {
     addUpdateHandler([&](const std::string &originId) { reconfigureMDNS(); }, false);
 }
 
@@ -28,15 +32,15 @@ void MDNSService::reconfigureMDNS() {
 }
 
 void MDNSService::startMDNS() {
-    ESP_LOGV(TAG, "Starting MDNS with hostname: %s", state().hostname.c_str());
+    ESP_LOGV(TAG, "Starting MDNS with hostname: %s", state().hostname);
 
-    if (MDNS.begin(state().hostname.c_str())) {
+    if (MDNS.begin(state().hostname)) {
         _started = true;
-        MDNS.setInstanceName(state().instance.c_str());
+        MDNS.setInstanceName(state().instance);
 
         addServices();
 
-        ESP_LOGI(TAG, "MDNS started successfully with hostname: %s", state().hostname.c_str());
+        ESP_LOGI(TAG, "MDNS started successfully with hostname: %s", state().hostname);
     } else {
         _started = false;
         ESP_LOGE(TAG, "Failed to start MDNS");
@@ -50,52 +54,71 @@ void MDNSService::stopMDNS() {
 }
 
 void MDNSService::addServices() {
-    for (const auto &service : state().services) {
-        MDNS.addService(service.service.c_str(), service.protocol.c_str(), service.port);
+    for (size_t i = 0; i < state().services_count; i++) {
+        const auto &service = state().services[i];
+        MDNS.addService(service.service, service.protocol, service.port);
 
-        for (const auto &txt : service.txtRecords) {
-            MDNS.addServiceTxt(service.service.c_str(), service.protocol.c_str(), txt.key.c_str(), txt.value.c_str());
+        for (size_t j = 0; j < service.txt_records_count; j++) {
+            const auto &txt = service.txt_records[j];
+            MDNS.addServiceTxt(service.service, service.protocol, txt.key, txt.value);
         }
     }
 
-    for (const auto &txt : state().globalTxtRecords) {
-        for (const auto &service : state().services) {
-            MDNS.addServiceTxt(service.service.c_str(), service.protocol.c_str(), txt.key.c_str(), txt.value.c_str());
+    for (size_t i = 0; i < state().global_txt_records_count; i++) {
+        const auto &txt = state().global_txt_records[i];
+        for (size_t j = 0; j < state().services_count; j++) {
+            const auto &service = state().services[j];
+            MDNS.addServiceTxt(service.service, service.protocol, txt.key, txt.value);
         }
     }
 }
 
 esp_err_t MDNSService::getStatus(httpd_req_t *request) {
-    JsonDocument doc;
-    JsonVariant root = doc.to<JsonVariant>();
-    getStatus(root);
-    return WebServer::sendJson(request, 200, doc);
-}
+    api_Response response = api_Response_init_zero;
+    response.which_payload = api_Response_mdns_status_tag;
 
-void MDNSService::getStatus(JsonVariant &root) {
-    state().read(state(), root);
-    root["started"] = _started;
-}
+    MDNSStatus &status = response.payload.mdns_status;
+    status.started = _started;
+    strncpy(status.hostname, state().hostname, sizeof(status.hostname) - 1);
+    strncpy(status.instance, state().instance, sizeof(status.instance) - 1);
 
-esp_err_t MDNSService::queryServices(httpd_req_t *request, JsonVariant &json) {
-    std::string service = json["service"].as<std::string>();
-    std::string proto = json["protocol"].as<std::string>();
-
-    JsonDocument doc;
-    JsonVariant root = doc.to<JsonVariant>();
-
-    ESP_LOGI(TAG, "Querying for service: %s, protocol: %s", service.c_str(), proto.c_str());
-
-    int n = MDNS.queryService(service.c_str(), proto.c_str());
-    ESP_LOGI(TAG, "Found %d services", n);
-
-    JsonArray servicesArray = root["services"].to<JsonArray>();
-    for (int i = 0; i < n; i++) {
-        JsonVariant serviceObj = servicesArray.add<JsonVariant>();
-        serviceObj["name"] = MDNS.hostname(i);
-        serviceObj["ip"] = MDNS.IP(i);
-        serviceObj["port"] = MDNS.port(i);
+    status.services_count = state().services_count;
+    for (size_t i = 0; i < state().services_count; i++) {
+        status.services[i] = state().services[i];
     }
 
-    return WebServer::sendJson(request, 200, doc);
+    status.global_txt_records_count = state().global_txt_records_count;
+    for (size_t i = 0; i < state().global_txt_records_count; i++) {
+        status.global_txt_records[i] = state().global_txt_records[i];
+    }
+
+    return WebServer::sendProto(request, 200, api_Response_fields, &response, api_Response_size);
+}
+
+esp_err_t MDNSService::queryServices(httpd_req_t *request, api_Request *protoReq) {
+    if (protoReq->which_payload != api_Request_mdns_query_request_tag) {
+        return WebServer::sendError(request, 400, "Invalid request payload");
+    }
+
+    const api_MDNSQueryRequest &queryReq = protoReq->payload.mdns_query_request;
+    ESP_LOGI(TAG, "Querying for service: %s, protocol: %s", queryReq.service, queryReq.protocol);
+
+    int n = MDNS.queryService(queryReq.service, queryReq.protocol);
+    ESP_LOGI(TAG, "Found %d services", n);
+
+    api_Response response = api_Response_init_zero;
+    response.which_payload = api_Response_mdns_query_response_tag;
+    api_MDNSQueryResponse &queryResp = response.payload.mdns_query_response;
+
+    // Limit to max_count from options file (16)
+    size_t count = (n > 16) ? 16 : static_cast<size_t>(n);
+    queryResp.services_count = count;
+
+    for (size_t i = 0; i < count; i++) {
+        strncpy(queryResp.services[i].name, MDNS.hostname(i).c_str(), sizeof(queryResp.services[i].name) - 1);
+        strncpy(queryResp.services[i].ip, MDNS.IP(i).toString().c_str(), sizeof(queryResp.services[i].ip) - 1);
+        queryResp.services[i].port = MDNS.port(i);
+    }
+
+    return WebServer::sendProto(request, 200, api_Response_fields, &response, api_Response_size);
 }
diff --git a/platform_shared/api.options b/platform_shared/api.options
index 82613d6..5ad07c6 100644
--- a/platform_shared/api.options
+++ b/platform_shared/api.options
@@ -23,3 +23,28 @@ api.WifiNetwork.ssid max_size:33
 api.WifiNetwork.password max_size:65
 api.WifiSettings.hostname max_size:33
 api.WifiSettings.wifi_networks max_count:5
+
+api.MDNSTxtRecord.key max_size:32
+api.MDNSTxtRecord.value max_size:64
+
+api.MDNSServiceDef.service max_size:16
+api.MDNSServiceDef.protocol max_size:8
+api.MDNSServiceDef.txt_records max_count:4
+
+api.MDNSSettings.hostname max_size:33
+api.MDNSSettings.instance max_size:64
+api.MDNSSettings.services max_count:4
+api.MDNSSettings.global_txt_records max_count:4
+
+api.MDNSStatus.hostname max_size:33
+api.MDNSStatus.instance max_size:64
+api.MDNSStatus.services max_count:4
+api.MDNSStatus.global_txt_records max_count:4
+
+api.MDNSQueryRequest.service max_size:16
+api.MDNSQueryRequest.protocol max_size:8
+
+api.MDNSQueryResult.name max_size:64
+api.MDNSQueryResult.ip max_size:46
+
+api.MDNSQueryResponse.services max_count:16
diff --git a/platform_shared/api.proto b/platform_shared/api.proto
index c3a99df..eb4fee5 100644
--- a/platform_shared/api.proto
+++ b/platform_shared/api.proto
@@ -125,6 +125,55 @@ message CameraSettings {
 
 message CameraSettingsRequest {}
 
+// =============================================================================
+// mDNS Settings - shared data types
+// =============================================================================
+
+message MDNSTxtRecord {
+    string key = 1;
+    string value = 2;
+}
+
+message MDNSServiceDef {
+    string service = 1;
+    string protocol = 2;
+    uint32 port = 3;
+    repeated MDNSTxtRecord txt_records = 4;
+}
+
+message MDNSSettings {
+    string hostname = 1;
+    string instance = 2;
+    repeated MDNSServiceDef services = 3;
+    repeated MDNSTxtRecord global_txt_records = 4;
+}
+
+message MDNSStatus {
+    bool started = 1;
+    string hostname = 2;
+    string instance = 3;
+    repeated MDNSServiceDef services = 4;
+    repeated MDNSTxtRecord global_txt_records = 5;
+}
+
+message MDNSSettingsRequest {}
+message MDNSStatusRequest {}
+
+message MDNSQueryRequest {
+    string service = 1;
+    string protocol = 2;
+}
+
+message MDNSQueryResult {
+    string name = 1;
+    string ip = 2;
+    uint32 port = 3;
+}
+
+message MDNSQueryResponse {
+    repeated MDNSQueryResult services = 1;
+}
+
 // =============================================================================
 // File System - shared data types
 // =============================================================================
@@ -175,6 +224,10 @@ message Request {
         WifiSettingsRequest wifi_settings_request = 41;
         CameraSettings camera_settings = 50;
         CameraSettingsRequest camera_settings_request = 51;
+        MDNSSettings mdns_settings = 60;
+        MDNSSettingsRequest mdns_settings_request = 61;
+        MDNSStatusRequest mdns_status_request = 62;
+        MDNSQueryRequest mdns_query_request = 63;
     }
 }
 
@@ -191,5 +244,8 @@ message Response {
         FileList file_list = 30;
         WifiSettings wifi_settings = 40;
         CameraSettings camera_settings = 50;
+        MDNSSettings mdns_settings = 60;
+        MDNSStatus mdns_status = 61;
+        MDNSQueryResponse mdns_query_response = 62;
     }
 }