move want_replies into new plugin system

src/mesh/MeshPlugin.cpp

@@ -1,4 +1,5 @@
 #include "MeshPlugin.h"
+#include "NodeDB.h"
 #include <assert.h>
 
 std::vector<MeshPlugin *> *MeshPlugin::plugins;
@@ -27,6 +28,11 @@ void MeshPlugin::callPlugins(const MeshPacket &mp)
         auto &pi = **i;
         if (pi.wantPortnum(mp.decoded.data.portnum)) {
             bool handled = pi.handleReceived(mp);
+
+            // Possibly send replies (unless we are handling a locally generated message)
+            if (mp.decoded.want_response && mp.from != nodeDB.getNodeNum())
+                pi.sendResponse(mp.from);
+
             DEBUG_MSG("Plugin %s handled=%d\n", pi.name, handled);
             if (handled)
                 break;

src/mesh/MeshPlugin.h

@@ -47,4 +47,10 @@ class MeshPlugin
     @return true if you've guaranteed you've handled this message and no other handlers should be considered for it
     */
     virtual bool handleReceived(const MeshPacket &mp) { return false; }
+
+    /** Messages can be received that have the want_response bit set.  If set, this callback will be invoked
+     * so that subclasses can (optionally) send a response back to the original sender.  Implementing this method
+     * is optional
+     */
+    virtual void sendResponse(NodeNum to) {}
 };

src/mesh/MeshService.cpp

@@ -96,9 +96,6 @@ int MeshService::handleFromRadio(const MeshPacket *mp)
     MeshPacket *copied = packetPool.allocCopy(*mp);
     assert(toPhoneQueue.enqueue(copied, 0)); // FIXME, instead of failing for full queue, delete the oldest mssages
 
-    if (mp->decoded.want_response)
-        sendNetworkPing(mp->from);
-
     return 0;
 }