Merge pull request #15227 from zul00/fix/lora_timing/join_req_retransmission/call_in

lorawan: Fix Join Request retransmission timing (Interop test)

Author: 0xc0170

connectivity/lorawan/source/LoRaWANStack.cpp

@@ -739,7 +739,10 @@ void LoRaWANStack::process_reception_timeout(bool is_timeout)
     _loramac.on_radio_rx_timeout(is_timeout);
 
     if (slot == RX_SLOT_WIN_2 && !_loramac.nwk_joined()) {
-        state_controller(DEVICE_STATE_JOINING);
+        const int ret = _queue->call_in(
+                            500, this, &LoRaWANStack::state_controller, DEVICE_STATE_JOINING);
+        MBED_ASSERT(ret != 0);
+        (void)ret;
         return;
     }