feat: settings rework part 2, domain and usecase abstraction, tests (#4680)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

core/model/src/commonMain/kotlin/org/meshtastic/core/model/ConnectionState.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 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
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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.core.model
+
+sealed class ConnectionState {
+    /** We are disconnected from the device, and we should be trying to reconnect. */
+    data object Disconnected : ConnectionState()
+
+    /** We are currently attempting to connect to the device. */
+    data object Connecting : ConnectionState()
+
+    /** We are connected to the device and communicating normally. */
+    data object Connected : ConnectionState()
+
+    /** The device is in a light sleep state, and we are waiting for it to wake up and reconnect to us. */
+    data object DeviceSleep : ConnectionState()
+
+    fun isConnected() = this == Connected
+
+    fun isConnecting() = this == Connecting
+
+    fun isDisconnected() = this == Disconnected
+
+    fun isDeviceSleep() = this == DeviceSleep
+}

core/model/src/commonMain/kotlin/org/meshtastic/core/model/RadioController.kt

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 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
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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.core.model
+
+import kotlinx.coroutines.flow.StateFlow
+import org.meshtastic.proto.ClientNotification
+
+@Suppress("TooManyFunctions")
+interface RadioController {
+    val connectionState: StateFlow<ConnectionState>
+    val clientNotification: StateFlow<ClientNotification?>
+
+    suspend fun sendMessage(packet: DataPacket)
+
+    fun clearClientNotification()
+
+    // Abstracted ServiceActions
+    suspend fun favoriteNode(nodeNum: Int)
+
+    suspend fun sendSharedContact(nodeNum: Int)
+
+    // Radio configuration
+    suspend fun setOwner(destNum: Int, user: org.meshtastic.proto.User, packetId: Int)
+
+    suspend fun setConfig(destNum: Int, config: org.meshtastic.proto.Config, packetId: Int)
+
+    suspend fun setModuleConfig(destNum: Int, config: org.meshtastic.proto.ModuleConfig, packetId: Int)
+
+    suspend fun setRemoteChannel(destNum: Int, channel: org.meshtastic.proto.Channel, packetId: Int)
+
+    suspend fun setFixedPosition(destNum: Int, position: Position)
+
+    suspend fun setRingtone(destNum: Int, ringtone: String)
+
+    suspend fun setCannedMessages(destNum: Int, messages: String)
+
+    // Admin get operations
+    suspend fun getOwner(destNum: Int, packetId: Int)
+
+    suspend fun getConfig(destNum: Int, configType: Int, packetId: Int)
+
+    suspend fun getModuleConfig(destNum: Int, moduleConfigType: Int, packetId: Int)
+
+    suspend fun getChannel(destNum: Int, index: Int, packetId: Int)
+
+    suspend fun getRingtone(destNum: Int, packetId: Int)
+
+    suspend fun getCannedMessages(destNum: Int, packetId: Int)
+
+    suspend fun getDeviceConnectionStatus(destNum: Int, packetId: Int)
+
+    // Admin operations
+    suspend fun reboot(destNum: Int, packetId: Int)
+
+    suspend fun shutdown(destNum: Int, packetId: Int)
+
+    suspend fun factoryReset(destNum: Int, packetId: Int)
+
+    suspend fun nodedbReset(destNum: Int, packetId: Int, preserveFavorites: Boolean)
+
+    suspend fun removeByNodenum(packetId: Int, nodeNum: Int)
+
+    // Batch editing
+    suspend fun beginEditSettings(destNum: Int)
+
+    suspend fun commitEditSettings(destNum: Int)
+
+    // Helpers
+    fun getPacketId(): Int
+
+    /** Starts providing the phone's location to the mesh. */
+    fun startProvideLocation()
+
+    /** Stops providing the phone's location to the mesh. */
+    fun stopProvideLocation()
+}