move lmic os sendjob to new lora_send task

include/lorawan.h

@@ -34,7 +34,7 @@ void os_getArtEui(u1_t *buf);
 void os_getDevEui(u1_t *buf);
 void showLoraKeys(void);
 void switch_lora(uint8_t sf, uint8_t tx);
-void lora_send(osjob_t *job);
+void lora_send(void *pvParameters);
 void lora_enqueuedata(MessageBuffer_t *message);
 void lora_queuereset(void);
 #if (TIME_SYNC_LORAWAN)

src/lorawan.cpp

@@ -18,9 +18,8 @@ static const char TAG[] = "lora";
 #endif
 #endif
 
-osjob_t sendjob;
 QueueHandle_t LoraSendQueue;
-TaskHandle_t lmicTask = NULL;
+TaskHandle_t lmicTask = NULL, lorasendTask = NULL;
 
 class MyHalConfig_t : public Arduino_LMIC::HalConfiguration_t {
 
@@ -218,8 +217,6 @@ void onEvent(ev_t ev) {
     // Set data rate and transmit power (note: txpower seems to be ignored by
     // the library)
     switch_lora(cfg.lorasf, cfg.txpower);
-    // kickoff first send job
-    os_setCallback(&sendjob, lora_send);
     // show effective LoRa parameters after join
     ESP_LOGI(TAG, "DEVaddr=%08X", LMIC.devaddr);
     break;
@@ -248,11 +245,6 @@ void onEvent(ev_t ev) {
                                                : PSTR("TX COMPLETE"));
     sprintf(display_line6, " "); // clear previous lmic status
 
-    // schedule next transmission with some random delay to prevent systematic
-    // collisions
-    os_setTimedCallback(&sendjob, os_getTime() + ms2osticks(random(500)),
-                        lora_send);
-
     if (LMIC.dataLen) { // did we receive payload data -> display info
       ESP_LOGI(TAG, "Received %d bytes of payload, RSSI %d SNR %d",
                LMIC.dataLen, LMIC.rssi, LMIC.snr / 4);
@@ -394,23 +386,27 @@ void switch_lora(uint8_t sf, uint8_t tx) {
   }
 }
 
-void lora_send(osjob_t *job) {
+// LMIC send task
+void lora_send(void *pvParameters) {
+  configASSERT(((uint32_t)pvParameters) == 1); // FreeRTOS check
+
   MessageBuffer_t SendBuffer;
 
-  // Check if there is not a current TX/RX job running
+  while (1) {
-  if (LMIC.opmode & OP_TXRXPEND) {
+    // fetch next / wait for payload to send from queue
-    ESP_LOGE(TAG, "LMIC busy, data not sent and lost");
-    return;
-  }
-
-  // fetch next payload to send from queue or wait until new payload shows up in
-  // queue
     if (xQueueReceive(LoraSendQueue, &SendBuffer, portMAX_DELAY) == pdTRUE) {
-    if (LMIC_setTxData2(SendBuffer.MessagePort, SendBuffer.Message,
+
-                        SendBuffer.MessageSize, (cfg.countermode & 0x02)) == 0)
+      // Check if there is not a current TX/RX job running
+      if (LMIC.opmode & OP_TXRXPEND)
+        lora_enqueuedata(&SendBuffer); // LMIC stack busy
+      else if (LMIC_setTxData2(SendBuffer.MessagePort, SendBuffer.Message,
+                               SendBuffer.MessageSize,
+                               (cfg.countermode & 0x02)) == 0)
         ESP_LOGI(TAG, "%d byte(s) delivered to LMIC", SendBuffer.MessageSize);
       else
-      lora_enqueuedata(&SendBuffer); // re-enqueue unsent message
+        lora_enqueuedata(&SendBuffer); // LMIC stack denied tx
+    }
+    delay(2); // yield to CPU
   }
 }
 
@@ -434,6 +430,15 @@ esp_err_t lora_stack_init() {
                           &lmicTask,  // task handle
                           1);         // CPU core
 
+  // starting lmic send task
+  xTaskCreatePinnedToCore(lora_send,      // task function
+                          "lorasendtask", // name of task
+                          2048,           // stack size of task
+                          (void *)1,      // parameter of the task
+                          2,              // priority of the task
+                          &lorasendTask,  // task handle
+                          1);             // CPU core
+
   if (!LMIC_startJoining()) { // start joining
     ESP_LOGI(TAG, "Already joined");
   }

src/main.cpp

@@ -36,6 +36,7 @@ timesync_req  1     3     processes realtime time sync requests
 lmictask      1     2     MCCI LMiC LORAWAN stack
 irqhandler    1     1     display, timesync, gps, etc. triggered by timers
 gpsloop       1     1     reads data from GPS via serial or i2c
+lorasendtask  1     1     feed data from lora sendqueue to lmcic
 IDLE          1     0     ESP32 arduino scheduler -> runs wifi channel rotator
 
 Low priority numbers denote low priority tasks.