Add route back and SNR lists to RouteDiscovery for traceroute

meshtastic/mesh.options

@@ -9,6 +9,11 @@
 *User.short_name max_size:5
 
 *RouteDiscovery.route max_count:8
+*RouteDiscovery.snr_towards max_count:8
+*RouteDiscovery.snr_towards int_size:8
+*RouteDiscovery.route_back max_count:8
+*RouteDiscovery.snr_back max_count:8
+*RouteDiscovery.snr_back int_size:8
 
 # note: this payload length is ONLY the bytes that are sent inside of the Data protobuf (excluding protobuf overhead). The 16 byte header is
 # outside of this envelope
@@ -67,4 +72,4 @@
 
 *ChunkedPayload.chunk_count int_size:16
 *ChunkedPayload.chunk_index int_size:16
-*ChunkedPayload.payload_chunk max_size:228
+*ChunkedPayload.payload_chunk max_size:228

meshtastic/mesh.proto

@@ -695,13 +695,28 @@ message User {
 }
 
 /*
- * A message used in our Dynamic Source Routing protocol (RFC 4728 based)
+ * A message used in a traceroute
  */
 message RouteDiscovery {
   /*
-   * The list of nodenums this packet has visited so far
+   * The list of nodenums this packet has visited so far to the destination.
    */
   repeated fixed32 route = 1;
+
+  /*
+   * The list of SNRs (in dB, scaled by 4) in the route towards the destination.
+   */
+  repeated int32 snr_towards = 2;
+
+  /*
+   * The list of nodenums the packet has visited on the way back from the destination.
+   */
+  repeated fixed32 route_back = 3;
+
+  /*
+   * The list of SNRs (in dB, scaled by 4) in the route back from the destination.
+   */
+  repeated int32 snr_back = 4;
 }
 
 /*
@@ -1850,4 +1865,4 @@ message ChunkedPayloadResponse {
      */
     resend_chunks resend_chunks = 4;
   }
-}
+}

meshtastic/portnums.proto

@@ -174,7 +174,7 @@ enum PortNum {
 
   /*
    * Provides a traceroute functionality to show the route a packet towards
-   * a certain destination would take on the mesh.
+   * a certain destination would take on the mesh. Contains a RouteDiscovery message as payload.
    * ENCODING: Protobuf
    */
   TRACEROUTE_APP = 70;
@@ -218,4 +218,4 @@ enum PortNum {
    * Currently we limit port nums to no higher than this value
    */
   MAX = 511;
-}
+}