feat: Add ESP32 Unified OTA update support (#4095)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

feature/settings/src/main/kotlin/org/meshtastic/feature/settings/SettingsScreen.kt

@@ -136,7 +136,7 @@ fun SettingsScreen(
     val localConfig by settingsViewModel.localConfig.collectAsStateWithLifecycle()
     val ourNode by settingsViewModel.ourNodeInfo.collectAsStateWithLifecycle()
     val isConnected by settingsViewModel.isConnected.collectAsStateWithLifecycle(false)
-    val isDfuCapable by settingsViewModel.isDfuCapable.collectAsStateWithLifecycle()
+    val isOtaCapable by settingsViewModel.isOtaCapable.collectAsStateWithLifecycle()
     val destNode by viewModel.destNode.collectAsState()
     val state by viewModel.radioConfigState.collectAsStateWithLifecycle()
     var isWaiting by remember { mutableStateOf(false) }
@@ -249,7 +249,7 @@ fun SettingsScreen(
                 isManaged = localConfig.security.isManaged,
                 node = destNode,
                 excludedModulesUnlocked = excludedModulesUnlocked,
-                isDfuCapable = isDfuCapable,
+                isOtaCapable = isOtaCapable,
                 onPreserveFavoritesToggle = { viewModel.setPreserveFavorites(it) },
                 onRouteClick = { route ->
                     isWaiting = true

feature/settings/src/main/kotlin/org/meshtastic/feature/settings/SettingsViewModel.kt

@@ -17,6 +17,7 @@
 package org.meshtastic.feature.settings
 
 import android.app.Application
+import android.icu.text.SimpleDateFormat
 import android.net.Uri
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
@@ -45,12 +46,14 @@ import org.meshtastic.core.database.DatabaseManager
 import org.meshtastic.core.database.entity.MyNodeEntity
 import org.meshtastic.core.database.model.Node
 import org.meshtastic.core.datastore.UiPreferencesDataSource
+import org.meshtastic.core.model.Capabilities
 import org.meshtastic.core.model.Position
 import org.meshtastic.core.model.util.positionToMeter
 import org.meshtastic.core.prefs.meshlog.MeshLogPrefs
 import org.meshtastic.core.prefs.radio.RadioPrefs
 import org.meshtastic.core.prefs.radio.isBle
 import org.meshtastic.core.prefs.radio.isSerial
+import org.meshtastic.core.prefs.radio.isTcp
 import org.meshtastic.core.prefs.ui.UiPrefs
 import org.meshtastic.core.service.IMeshService
 import org.meshtastic.core.service.ServiceRepository
@@ -61,7 +64,6 @@ import org.meshtastic.proto.Portnums
 import java.io.BufferedWriter
 import java.io.FileNotFoundException
 import java.io.FileWriter
-import java.text.SimpleDateFormat
 import java.util.Locale
 import javax.inject.Inject
 import kotlin.math.roundToInt
@@ -118,15 +120,22 @@ constructor(
     val appVersionName
         get() = buildConfigProvider.versionName
 
-    val isDfuCapable: StateFlow<Boolean> =
+    val isOtaCapable: StateFlow<Boolean> =
         combine(ourNodeInfo, serviceRepository.connectionState) { node, connectionState -> Pair(node, connectionState) }
             .flatMapLatest { (node, connectionState) ->
                 if (node == null || !connectionState.isConnected()) {
                     flowOf(false)
-                } else if (radioPrefs.isBle() || radioPrefs.isSerial()) {
+                } else if (radioPrefs.isBle() || radioPrefs.isSerial() || radioPrefs.isTcp()) {
                     val hwModel = node.user.hwModel.number
                     val hw = deviceHardwareRepository.getDeviceHardwareByModel(hwModel).getOrNull()
-                    flow { emit(hw?.requiresDfu == true) }
+                    // Support both Nordic DFU (requiresDfu) and ESP32 Unified OTA (supportsUnifiedOta)
+                    val capabilities = Capabilities(node.metadata?.firmwareVersion)
+
+                    // ESP32 Unified OTA is only supported via BLE or WiFi (TCP), not USB Serial.
+                    val isEsp32OtaSupported =
+                        hw?.supportsUnifiedOta == true && capabilities.supportsEsp32Ota && !radioPrefs.isSerial()
+
+                    flow { emit(hw?.requiresDfu == true || isEsp32OtaSupported) }
                 } else {
                     flowOf(false)
                 }

feature/settings/src/main/kotlin/org/meshtastic/feature/settings/radio/RadioConfig.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2025 Meshtastic LLC
+ * Copyright (c) 2025-2026 Meshtastic LLC
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -14,7 +14,6 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-
 package org.meshtastic.feature.settings.radio
 
 import androidx.compose.foundation.layout.Arrangement
@@ -88,7 +87,7 @@ fun RadioConfigItemList(
     isManaged: Boolean,
     node: Node? = null,
     excludedModulesUnlocked: Boolean = false,
-    isDfuCapable: Boolean = false,
+    isOtaCapable: Boolean = false,
     onPreserveFavoritesToggle: (Boolean) -> Unit = {},
     onRouteClick: (Enum<*>) -> Unit = {},
     onImport: () -> Unit = {},
@@ -212,7 +211,7 @@ fun RadioConfigItemList(
             ManagedMessage()
         }
 
-        if (isDfuCapable && state.isLocal) {
+        if (isOtaCapable && state.isLocal) {
             ListItem(
                 text = stringResource(Res.string.firmware_update_title),
                 leadingIcon = Icons.Rounded.SystemUpdate,