feat: add getChannelSet method to IMeshService

app/src/main/aidl/com/geeksville/mesh/IMeshService.aidl

@@ -116,6 +116,9 @@ interface IMeshService {
     /// Send NodedbReset admin packet to nodeNum
     void requestNodedbReset(in int idNum);
 
+    /// Returns a ChannelSet protobuf
+    byte []getChannelSet();
+
     /**
     Is the packet radio currently connected to the phone?  Returns a ConnectionState string.
     */

app/src/main/java/com/geeksville/mesh/service/MeshService.kt

@@ -252,6 +252,8 @@ class MeshService : Service(), Logging {
             .launchIn(serviceScope)
         localConfigRepository.localConfigFlow.onEach { localConfig = it }
             .launchIn(serviceScope)
+        channelSetRepository.channelSetFlow.onEach { channelSet = it }
+            .launchIn(serviceScope)
 
         // the rest of our init will happen once we are in radioConnection.onServiceConnected
     }
@@ -364,6 +366,7 @@ class MeshService : Service(), Logging {
     var myNodeInfo: MyNodeInfo? = null
 
     private var localConfig: LocalConfig = LocalConfig.getDefaultInstance()
+    private var channelSet: AppOnlyProtos.ChannelSet = AppOnlyProtos.ChannelSet.getDefaultInstance()
 
     /// True after we've done our initial node db init
     @Volatile
@@ -1721,6 +1724,10 @@ class MeshService : Service(), Logging {
             })
         }
 
+        override fun getChannelSet(): ByteArray = toRemoteExceptions {
+            this@MeshService.channelSet.toByteArray()
+        }
+
         override fun getNodes(): MutableList<NodeInfo> = toRemoteExceptions {
             val r = nodeDBbyID.values.toMutableList()
             info("in getOnline, count=${r.size}")