147 lines
4.4 KiB
C++
147 lines
4.4 KiB
C++
/*******************************************************************************
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*
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* ttn-esp32 - The Things Network device library for ESP-IDF / SX127x
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*
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* Copyright (c) 2018 Manuel Bleichenbacher
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*
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* Licensed under MIT License
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* https://opensource.org/licenses/MIT
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*
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* Sample program showing how to send and receive messages.
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*******************************************************************************/
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#include "freertos/FreeRTOS.h"
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#include "esp_event.h"
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#include "driver/gpio.h"
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#include "nvs_flash.h"
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#include "TheThingsNetwork.h"
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// NOTE:
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// The LoRaWAN frequency and the radio chip must be configured by running 'idf.py menuconfig'.
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// Go to Components / The Things Network, select the appropriate values and save.
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// Copy the below hex strings from the TTN console (Applications > Your application > End devices
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// > Your device > Activation information)
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// AppEUI (sometimes called JoinEUI)
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const char *appEui = "????????????????";
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// DevEUI
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const char *devEui = "????????????????";
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// AppKey
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const char *appKey = "????????????????????????????????";
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// Pins and other resources
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#define TTN_SPI_HOST SPI2_HOST
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#define TTN_SPI_DMA_CHAN SPI_DMA_DISABLED
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#define TTN_PIN_SPI_SCLK 5
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#define TTN_PIN_SPI_MOSI 27
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#define TTN_PIN_SPI_MISO 19
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#define TTN_PIN_NSS 18
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#define TTN_PIN_RXTX TTN_NOT_CONNECTED
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#define TTN_PIN_RST 14
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#define TTN_PIN_DIO0 26
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#define TTN_PIN_DIO1 35
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static TheThingsNetwork ttn;
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const unsigned TX_INTERVAL = 30;
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static uint8_t msgData[] = "Hello, world";
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void printRFSettings(const char* window, const TTNRFSettings& settings)
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{
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int bw = (1 << (static_cast<int>(settings.bandwidth) - 1)) * 125;
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int sf = static_cast<int>(settings.spreadingFactor) + 5;
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if (settings.spreadingFactor == kTTNSFNone)
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{
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printf("%s: not used\n", window);
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}
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else if (settings.spreadingFactor == kTTNFSK)
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{
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printf("%s: FSK, BW %dkHz, %d.%d MHz\n",
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window, bw, settings.frequency / 1000000, (settings.frequency % 1000000 + 50000) / 100000);
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}
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else
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{
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printf("%s: SF%d, BW %dkHz, %d.%d MHz\n",
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window, sf, bw, settings.frequency / 1000000, (settings.frequency % 1000000 + 50000) / 100000);
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}
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}
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void printAllRFSettings()
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{
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printRFSettings("TX ", ttn.txSettings());
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printRFSettings("RX1", ttn.rx1Settings());
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printRFSettings("RX2", ttn.rx2Settings());
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}
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void sendMessages(void* pvParameter)
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{
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while (1) {
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printf("Sending message...\n");
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TTNResponseCode res = ttn.transmitMessage(msgData, sizeof(msgData) - 1);
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printf(res == kTTNSuccessfulTransmission ? "Message sent.\n" : "Transmission failed.\n");
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printAllRFSettings();
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vTaskDelay(TX_INTERVAL * pdMS_TO_TICKS(1000));
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}
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}
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void messageReceived(const uint8_t* message, size_t length, ttn_port_t port)
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{
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printf("Message of %d bytes received on port %d:", length, port);
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for (int i = 0; i < length; i++)
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printf(" %02x", message[i]);
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printf("\n");
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printf("RSSI: %d dBm\n", ttn.rssi());
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}
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extern "C" void app_main(void)
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{
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esp_err_t err;
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// Initialize the GPIO ISR handler service
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err = gpio_install_isr_service(ESP_INTR_FLAG_IRAM);
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ESP_ERROR_CHECK(err);
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// Initialize the NVS (non-volatile storage) for saving and restoring the keys
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err = nvs_flash_init();
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ESP_ERROR_CHECK(err);
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// Initialize SPI bus
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spi_bus_config_t spi_bus_config;
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spi_bus_config.miso_io_num = TTN_PIN_SPI_MISO;
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spi_bus_config.mosi_io_num = TTN_PIN_SPI_MOSI;
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spi_bus_config.sclk_io_num = TTN_PIN_SPI_SCLK;
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spi_bus_config.quadwp_io_num = -1;
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spi_bus_config.quadhd_io_num = -1;
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spi_bus_config.max_transfer_sz = 0;
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err = spi_bus_initialize(TTN_SPI_HOST, &spi_bus_config, TTN_SPI_DMA_CHAN);
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ESP_ERROR_CHECK(err);
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// Configure the SX127x pins
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ttn.configurePins(TTN_SPI_HOST, TTN_PIN_NSS, TTN_PIN_RXTX, TTN_PIN_RST, TTN_PIN_DIO0, TTN_PIN_DIO1);
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// The below line can be commented after the first run as the data is saved in NVS
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ttn.provision(devEui, appEui, appKey);
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// Register callback for received messages
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ttn.onMessage(messageReceived);
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printf("Joining...\n");
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if (ttn.join())
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{
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printf("Joined.\n");
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printAllRFSettings();
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printf("RSSI: %d dBm\n", ttn.rssi());
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xTaskCreate(sendMessages, "send_messages", 1024 * 4, (void* )0, 3, nullptr);
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}
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else
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{
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printf("Join failed. Goodbye\n");
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}
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}
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