Handle for heartbeat toradio packets (#3420)

src/SerialConsole.cpp

@@ -72,7 +72,7 @@ bool SerialConsole::checkIsConnected()
 
 /**
  * we override this to notice when we've received a protobuf over the serial
- * stream.  Then we shunt off debug serial output.
+ * stream.  Then we shut off debug serial output.
  */
 bool SerialConsole::handleToRadio(const uint8_t *buf, size_t len)
 {

src/mesh/PhoneAPI.cpp

@@ -113,6 +113,9 @@ bool PhoneAPI::handleToRadio(const uint8_t *buf, size_t bufLength)
                          "not enabled\n");
             }
             break;
+        case meshtastic_ToRadio_heartbeat_tag:
+            LOG_DEBUG("Got client heartbeat\n");
+            break;
         default:
             // Ignore nop messages
             // LOG_DEBUG("Error: unexpected ToRadio variant\n");