Power off for C++

examples/power_off/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+# Update the below line to match the path to the ttn-esp32 library,
+# e.g. list(APPEND EXTRA_COMPONENT_DIRS "/Users/me/Documents/ttn-esp32")
+list(APPEND EXTRA_COMPONENT_DIRS "../..")
+
+#add_definitions(-DLMIC_ENABLE_event_logging=1)
+
+project(power_off)

examples/power_off/main/CMakeLists.txt

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+idf_component_register(
+    SRCS "main.cpp"
+    INCLUDE_DIRS "."
+    REQUIRES ttn-esp32)

examples/power_off/main/main.cpp

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+/*******************************************************************************
+ *
+ * ttn-esp32 - The Things Network device library for ESP-IDF / SX127x
+ *
+ * Copyright (c) 2021 Manuel Bleichenbacher
+ *
+ * Licensed under MIT License
+ * https://opensource.org/licenses/MIT
+ *
+ * Sample program sending messages and going to deep sleep in-between.
+ *******************************************************************************/
+
+#include "driver/gpio.h"
+#include "esp_event.h"
+#include "esp_sleep.h"
+#include "freertos/FreeRTOS.h"
+#include "nvs_flash.h"
+
+#include "TheThingsNetwork.h"
+
+// NOTE:
+// The LoRaWAN frequency and the radio chip must be configured by running 'idf.py menuconfig'.
+// Go to Components / The Things Network, select the appropriate values and save.
+
+// Copy the below hex strings from the TTN console (Applications > Your application > End devices
+// > Your device > Activation information)
+
+// AppEUI (sometimes called JoinEUI)
+const char *appEui = "????????????????";
+// DevEUI
+const char *devEui = "????????????????";
+// AppKey
+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 = 60;
+static uint8_t msgData[] = "Hello, world";
+
+void messageReceived(const uint8_t *message, size_t length, ttn_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);
+
+    // Register callback for received messages
+    ttn.onMessage(messageReceived);
+
+    //    ttn.setAdrEnabled(false);
+    //    ttn.setDataRate(kTTNDataRate_US915_SF7);
+    //    ttn.setMaxTxPower(14);
+
+    if (ttn.resumeAfterPowerOff(60))
+    {
+        printf("Resumed from power off.\n");
+    }
+    else
+    {
+        printf("Joining...\n");
+        if (ttn.join())
+        {
+            printf("Joined.\n");
+        }
+        else
+        {
+            printf("Join failed. Goodbye\n");
+            return;
+        }
+    }
+
+    printf("Sending message...\n");
+    TTNResponseCode res = ttn.transmitMessage(msgData, sizeof(msgData) - 1);
+    printf(res == kTTNSuccessfulTransmission ? "Message sent.\n" : "Transmission failed.\n");
+
+    // Wait until TTN communication is idle and save state
+    ttn.waitForIdle();
+    ttn.prepareForPowerOff();
+
+    printf("Power off...\n");
+    // Do whatever is needed to power off the device.
+    // For testing, press reset button to simulate power cycle.
+    while (true)
+        vTaskDelay(pdMS_TO_TICKS(1000));
+}