Add shutdown function

src/TTNProvisioning.cpp

@@ -97,6 +97,7 @@ void ttn_provisioning_task_caller(void* pvParameter)
 {
     TTNProvisioning* provisioning = (TTNProvisioning*)pvParameter;
     provisioning->provisioningTask();
+    vTaskDelete(nullptr);
 }
 
 void TTNProvisioning::provisioningTask()
@@ -132,7 +133,6 @@ void TTNProvisioning::provisioningTask()
 
     free(line_buf);
     uart_driver_delete(UART_NUM);
-    vTaskDelete(nullptr);
 }
 
 void TTNProvisioning::addLineData(int numBytes)

src/TheThingsNetwork.cpp

@@ -111,10 +111,23 @@ void TheThingsNetwork::reset()
     ttn_hal.enterCriticalSection();
     LMIC_reset();
     waitingReason = eWaitingNone;
-    if (lmicEventQueue != nullptr)
-    {
-        xQueueReset(lmicEventQueue);
-    }
+    ttn_hal.leaveCriticalSection();
+}
+
+void TheThingsNetwork::shutdown()
+{
+    ttn_hal.enterCriticalSection();
+    LMIC_shutdown();
+    ttn_hal.stopLMICTask();
+    waitingReason = eWaitingNone;
+    ttn_hal.leaveCriticalSection();
+}
+
+void TheThingsNetwork::startup()
+{
+    ttn_hal.enterCriticalSection();
+    LMIC_reset();
+    ttn_hal.startLMICTask();
     ttn_hal.leaveCriticalSection();
 }
 
@@ -194,6 +207,7 @@ bool TheThingsNetwork::joinCore()
     }
 
     ttn_hal.enterCriticalSection();
+    xQueueReset(lmicEventQueue);
     waitingReason = eWaitingForJoin;
     LMIC_startJoining();
     ttn_hal.wakeUp();

src/hal/hal_esp32.cpp

@@ -25,6 +25,7 @@
 #define NOTIFY_BIT_DIO 1
 #define NOTIFY_BIT_TIMER 2
 #define NOTIFY_BIT_WAKEUP 4
+#define NOTIFY_BIT_STOP 8
 
 
 static const char* const TAG = "ttn_hal";
@@ -305,6 +306,9 @@ bool HAL_ESP32::wait(WaitKind waitKind)
         if (bits == 0)
             return false;
 
+        if ((bits & NOTIFY_BIT_STOP) != 0)
+            return false;
+
         if ((bits & NOTIFY_BIT_WAKEUP) != 0)
         {
             if (waitKind != WAIT_FOR_TIMER)
@@ -449,8 +453,12 @@ void HAL_ESP32::leaveCriticalSection()
 
 // -----------------------------------------------------------------------------
 
-void HAL_ESP32::lmicBackgroundTask(void* pvParameter) {
-    os_runloop();
+void HAL_ESP32::lmicBackgroundTask(void* pvParameter)
+{
+    HAL_ESP32* instance = (HAL_ESP32*)pvParameter;
+    while (instance->runBackgroundTask)
+        os_runloop_once();
+    vTaskDelete(nullptr);
 }
 
 void hal_init_ex(const void *pContext)
@@ -468,14 +476,25 @@ void HAL_ESP32::init()
     timerInit();
 }
 
-void HAL_ESP32::startLMICTask() {
-    xTaskCreate(lmicBackgroundTask, "ttn_lmic", 1024 * 4, nullptr, CONFIG_TTN_BG_TASK_PRIO, &lmicTask);
+void HAL_ESP32::startLMICTask()
+{
+    runBackgroundTask = true;
+    xTaskCreate(lmicBackgroundTask, "ttn_lmic", 1024 * 4, this, CONFIG_TTN_BG_TASK_PRIO, &lmicTask);
 
     // enable interrupts
     gpio_isr_handler_add(pinDIO0, dioIrqHandler, (void *)0);
     gpio_isr_handler_add(pinDIO1, dioIrqHandler, (void *)1);
 }
 
+void HAL_ESP32::stopLMICTask()
+{
+    runBackgroundTask = false;
+    gpio_isr_handler_remove(pinDIO0);
+    gpio_isr_handler_remove(pinDIO1);
+    disarmTimer();
+    xTaskNotify(lmicTask, NOTIFY_BIT_STOP, eSetBits);
+}
+
 
 // -----------------------------------------------------------------------------
 // Fatal failure

src/hal/hal_esp32.h

@@ -39,6 +39,7 @@ public:
     void configurePins(spi_host_device_t spi_host, uint8_t nss, uint8_t rxtx, uint8_t rst, uint8_t dio0, uint8_t dio1);
     void init();
     void startLMICTask();
+    void stopLMICTask();
     
     void wakeUp();
     void initCriticalSection();
@@ -84,6 +85,7 @@ private:
     SemaphoreHandle_t mutex;
     esp_timer_handle_t timer;
     int64_t nextAlarm;
+    volatile bool runBackgroundTask;
 };
 
 extern HAL_ESP32 ttn_hal;