Add rssi() function

examples/monitoring/main/main.cpp

@@ -93,6 +93,7 @@ void messageReceived(const uint8_t* message, size_t length, port_t port)
     for (int i = 0; i < length; i++)
         printf(" %02x", message[i]);
     printf("\n");
+    printf("RSSI: %d dBm\n", ttn.rssi());
 }
 
 extern "C" void app_main(void)
@@ -131,6 +132,7 @@ extern "C" void app_main(void)
     {
         printf("Joined.\n");
         printAllRFSettings();
+        printf("RSSI: %d dBm\n", ttn.rssi());
         xTaskCreate(sendMessages, "send_messages", 1024 * 4, (void* )0, 3, nullptr);
     }
     else

include/TheThingsNetwork.h

@@ -400,6 +400,15 @@ public:
      */
     TTNRFSettings rx2Settings();
 
+    /**
+     * @brief Gets the received signal strength indicator (RSSI).
+     * 
+     * RSSI is the measured signal strength of the last recevied message (incl. join responses).
+     * 
+     * @return RSSI, in dBm
+     */
+    int rssi();
+
 private:
     TTNMessageCallback messageCallback;
 

src/TheThingsNetwork.cpp

@@ -320,6 +320,11 @@ TTNRxTxWindow TheThingsNetwork::rxTxWindow()
     return currentWindow;
 }
 
+int TheThingsNetwork::rssi()
+{
+    return LMIC.rssi;
+}
+
 
 // --- Callbacks ---