Add shutdown function

examples/shutdown/CMakeLists.txt

@@ -0,0 +1,9 @@
+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+get_filename_component(TTN_DIR ../.. ABSOLUTE)
+set(EXTRA_COMPONENT_DIRS "${TTN_DIR}")
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(send_recv)

examples/shutdown/Makefile

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+PROJECT_NAME := shutdown
+
+EXTRA_COMPONENT_DIRS := $(abspath ../..)
+
+include $(IDF_PATH)/make/project.mk

examples/shutdown/main/CMakeLists.txt

@@ -0,0 +1,4 @@
+set(COMPONENT_SRCS "main.cpp")
+set(COMPONENT_ADD_INCLUDEDIRS "")
+
+register_component()

examples/shutdown/main/main.cpp

@@ -0,0 +1,137 @@
+/*******************************************************************************
+ * 
+ * ttn-esp32 - The Things Network device library for ESP-IDF / SX127x
+ * 
+ * Copyright (c) 2018 Manuel Bleichenbacher
+ * 
+ * Licensed under MIT License
+ * https://opensource.org/licenses/MIT
+ *
+ * Sample program showing how to send and receive messages.
+ *******************************************************************************/
+
+#include "freertos/FreeRTOS.h"
+#include "esp_event.h"
+#include "driver/gpio.h"
+#include "nvs_flash.h"
+
+#include "TheThingsNetwork.h"
+
+// NOTE:
+// The LoRaWAN frequency and the radio chip must be configured by running 'make menuconfig'.
+// Go to Components / The Things Network, select the appropriate values and save.
+
+// Copy the below hex string from the "Device EUI" field
+// on your device's overview page in the TTN console.
+const char *devEui = "????????????????";
+
+// Copy the below two lines from bottom of the same page
+const char *appEui = "????????????????";
+const char *appKey = "????????????????????????????????";
+
+// Pins and other resources
+#define TTN_SPI_HOST      HSPI_HOST
+#define TTN_SPI_DMA_CHAN  1
+#define TTN_PIN_SPI_SCLK  5
+#define TTN_PIN_SPI_MOSI  27
+#define TTN_PIN_SPI_MISO  19
+#define TTN_PIN_NSS       18
+#define TTN_PIN_RXTX      TTN_NOT_CONNECTED
+#define TTN_PIN_RST       14
+#define TTN_PIN_DIO0      26
+#define TTN_PIN_DIO1      35
+
+static TheThingsNetwork ttn;
+
+const unsigned TX_INTERVAL = 30;
+static uint8_t msgData[] = "Hello, world";
+
+bool join()
+{
+    printf("Joining...\n");
+    if (ttn.join())
+    {
+        printf("Joined.\n");
+        return true;
+    }
+    else
+    {
+        printf("Join failed. Goodbye\n");
+        return false;
+    }
+}
+
+
+void sendMessages(void* pvParameter)
+{
+    while (1) {
+
+        // Send 2 messages
+        for (int i = 0; i < 2; i++)
+        {
+            printf("Sending message...\n");
+            TTNResponseCode res = ttn.transmitMessage(msgData, sizeof(msgData) - 1);
+            printf(res == kTTNSuccessfulTransmission ? "Message sent.\n" : "Transmission failed.\n");
+
+            vTaskDelay(TX_INTERVAL * pdMS_TO_TICKS(1000));
+        }
+
+        // shutdown
+        ttn.shutdown();
+
+        // go to sleep
+        printf("Sleeping for 30s...\n");
+        vTaskDelay(pdMS_TO_TICKS(30000));
+
+        // startup
+        ttn.startup();
+
+        // join again
+        if (!join())
+            return;
+    }
+}
+
+void messageReceived(const uint8_t* message, size_t length, port_t port)
+{
+    printf("Message of %d bytes received on port %d:", length, port);
+    for (int i = 0; i < length; i++)
+        printf(" %02x", message[i]);
+    printf("\n");
+}
+
+extern "C" void app_main(void)
+{
+    esp_err_t err;
+    // Initialize the GPIO ISR handler service
+    err = gpio_install_isr_service(ESP_INTR_FLAG_IRAM);
+    ESP_ERROR_CHECK(err);
+    
+    // Initialize the NVS (non-volatile storage) for saving and restoring the keys
+    err = nvs_flash_init();
+    ESP_ERROR_CHECK(err);
+
+    // Initialize SPI bus
+    spi_bus_config_t spi_bus_config;
+    spi_bus_config.miso_io_num = TTN_PIN_SPI_MISO;
+    spi_bus_config.mosi_io_num = TTN_PIN_SPI_MOSI;
+    spi_bus_config.sclk_io_num = TTN_PIN_SPI_SCLK;
+    spi_bus_config.quadwp_io_num = -1;
+    spi_bus_config.quadhd_io_num = -1;
+    spi_bus_config.max_transfer_sz = 0;
+    err = spi_bus_initialize(TTN_SPI_HOST, &spi_bus_config, TTN_SPI_DMA_CHAN);
+    ESP_ERROR_CHECK(err);
+
+    // Configure the SX127x pins
+    ttn.configurePins(TTN_SPI_HOST, TTN_PIN_NSS, TTN_PIN_RXTX, TTN_PIN_RST, TTN_PIN_DIO0, TTN_PIN_DIO1);
+
+    // The below line can be commented after the first run as the data is saved in NVS
+    ttn.provision(devEui, appEui, appKey);
+
+    ttn.onMessage(messageReceived);
+
+    if (join())
+    {
+        xTaskCreate(sendMessages, "send_messages", 1024 * 4, (void* )0, 3, nullptr);
+    }
+}