Enabled dutycycle and changed scheduling

main.cpp

@@ -130,6 +130,24 @@ int main(void) {
  */
 static void send_message() {
     int16_t retcode;
+    int eid;
+
+    // setup next transmission
+    eid = ev_queue.call_in(MBED_CONF_APP_TX_TIMER, send_message);
+
+    // check backoff time before sending new frame
+    if (MBED_CONF_LORA_DUTY_CYCLE_ON) {
+        lorawan_status_t status;
+        int backoff;
+
+        status = lorawan.get_backoff_metadata(backoff);
+        if (status == LORAWAN_STATUS_OK && backoff > 0) {
+            debug("\r\n %d ms backoff, delay next send \r\n", backoff);
+            ev_queue.cancel(eid);
+            ev_queue.call_in(backoff+MBED_CONF_APP_TX_TIMER, send_message);
+            return;
+        }
+    }
 
 #if MBED_CONF_APP_DHT_ENABLED
     int err = dht.read();
@@ -199,13 +217,7 @@ static void lora_event_handler(lorawan_event_t event) {
     switch(event) {
         case CONNECTED:
             debug("\r\n Connection - Successful \r\n");
-            if(MBED_CONF_LORA_DUTY_CYCLE_ON) {
+            send_message();
-                send_message();
-            } else {
-                send_message();
-                ev_queue.call_every(MBED_CONF_APP_TX_TIMER, send_message);
-            }
-
             break;
         case DISCONNECTED:
             ev_queue.break_dispatch();
@@ -213,19 +225,12 @@ static void lora_event_handler(lorawan_event_t event) {
             break;
         case TX_DONE:
             debug("\r\n Message Sent to Network Server \r\n");
-            if(MBED_CONF_LORA_DUTY_CYCLE_ON) {
-                send_message();
-            }
             break;
         case TX_TIMEOUT:
         case TX_ERROR:
         case TX_CRYPTO_ERROR:
         case TX_SCHEDULING_ERROR:
             debug("\r\n Transmission Error - EventCode = %d \r\n", event);
-            // try again
-            if(MBED_CONF_LORA_DUTY_CYCLE_ON) {
-                send_message();
-            }
             break;
         case RX_DONE:
             debug("\r\n Received message from Network Server \r\n");

mbed_app.json

@@ -50,7 +50,7 @@
             "platform.default-serial-baud-rate": 115200,
             "lora.app-port": 3,
             "lora.over-the-air-activation": true,
-            "lora.duty-cycle-on": false,
+            "lora.duty-cycle-on": true,
             "lora.phy": 0,
             "lora.device-eui": "{ 0xAB, 0xBA, 0xAB, 0xBA, 0xAB, 0xBA, 0xAB, 0xBA }",
             "lora.application-eui": "{ 0xAC, 0xCA, 0xAC, 0xCA, 0xAC, 0xCA, 0xAC, 0xCA }",