* new Packet type: PAYLOAD_TYPE_TRACE

examples/simple_secure_chat/main.cpp

@@ -268,6 +268,10 @@ protected:
     // not supported
   }
 
+  void onContactTraceRecv(const ContactInfo& contact, uint32_t sender_timestamp, const uint8_t hash[], int8_t snr[], uint8_t path_len) override {
+    // TODO: write an out_frame
+  }
+
   uint32_t calcFloodTimeoutMillisFor(uint32_t pkt_airtime_millis) const override {
     return SEND_TIMEOUT_BASE_MILLIS + (FLOOD_SEND_TIMEOUT_FACTOR * pkt_airtime_millis);
   }