Feat/6704 neighbor info on demand

src/modules/NeighborInfoModule.cpp

@@ -101,12 +101,12 @@ void NeighborInfoModule::cleanUpNeighbors()
 }
 
 /* Send neighbor info to the mesh */
-void NeighborInfoModule::sendNeighborInfo(NodeNum dest, bool wantReplies)
+void NeighborInfoModule::sendNeighborInfo(NodeNum dest, bool wantReplies, bool sendEmpty)
 {
     meshtastic_NeighborInfo neighborInfo = meshtastic_NeighborInfo_init_zero;
     collectNeighborInfo(&neighborInfo);
     // only send neighbours if we have some to send
-    if (neighborInfo.neighbors_count > 0) {
+    if (neighborInfo.neighbors_count > 0 or sendEmpty) {
         meshtastic_MeshPacket *p = allocDataProtobuf(neighborInfo);
         p->to = dest;
         p->decoded.want_response = wantReplies;
@@ -138,13 +138,19 @@ Pass it to an upper client; do not persist this data on the mesh
 */
 bool NeighborInfoModule::handleReceivedProtobuf(const meshtastic_MeshPacket &mp, meshtastic_NeighborInfo *np)
 {
+    LOG_DEBUG("NeighborInfo: handleRecievedProtobuf");
     if (np) {
         printNeighborInfo("RECEIVED", np);
         updateNeighbors(mp, np);
     } else if (mp.hop_start != 0 && mp.hop_start == mp.hop_limit) {
         // If the hopLimit is the same as hopStart, then it is a neighbor
         getOrCreateNeighbor(mp.from, mp.from, 0, mp.rx_snr); // Set the broadcast interval to 0, as we don't know it
     }
+    if (mp.decoded.want_response && np->neighbors_count == 0) { // want response, and is otherwise empty.
+        LOG_INFO("NeighborInfoRequested.");
+        sendNeighborInfo(mp.from, false, true); // do we want this to be dm, or broadcast?
+        // sendNeighborInfo(NODENUM_BROADCAST, false); // do we want this to be dm, or broadcast?
+    }
     // Allow others to handle this packet
     return false;
 }
@@ -168,6 +174,7 @@ void NeighborInfoModule::resetNeighbors()
 
 void NeighborInfoModule::updateNeighbors(const meshtastic_MeshPacket &mp, const meshtastic_NeighborInfo *np)
 {
+    LOG_DEBUG("updateNeighbors");
     // The last sent ID will be 0 if the packet is from the phone, which we don't count as
     // an edge. So we assume that if it's zero, then this packet is from our node.
     if (mp.which_payload_variant == meshtastic_MeshPacket_decoded_tag && mp.from) {

src/modules/NeighborInfoModule.h

@@ -48,7 +48,7 @@ class NeighborInfoModule : public ProtobufModule<meshtastic_NeighborInfo>, priva
     /*
      * Send info on our node's neighbors into the mesh
      */
-    void sendNeighborInfo(NodeNum dest = NODENUM_BROADCAST, bool wantReplies = false);
+    void sendNeighborInfo(NodeNum dest = NODENUM_BROADCAST, bool wantReplies = false, bool sendEmpty = false);
 
     /* update neighbors with subpacket sniffed from network */
     void updateNeighbors(const meshtastic_MeshPacket &mp, const meshtastic_NeighborInfo *np);