mirror of
https://github.com/manuelbl/ttn-esp32.git
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136 lines
3.9 KiB
C
136 lines
3.9 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) 2021 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 (in C) sending messages and going to deep sleep in-between.
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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 "esp_log.h"
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#include "esp_sleep.h"
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#include <stdio.h>
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#include <string.h>
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#include "ttn.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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#define TX_INTERVAL 60 // in sec
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// This counter value is retained (in RTC memory) during deep sleep
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RTC_DATA_ATTR int counter_in_rtc_mem;
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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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}
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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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.miso_io_num = TTN_PIN_SPI_MISO,
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.mosi_io_num = TTN_PIN_SPI_MOSI,
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.sclk_io_num = TTN_PIN_SPI_SCLK,
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.quadwp_io_num = -1,
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.quadhd_io_num = -1
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};
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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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// Initialize TTN
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ttn_init();
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// Configure the SX127x pins
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ttn_configure_pins(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_on_message(messageReceived);
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// ttn_set_adr_enabled(false);
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// ttn_set_data_rate(TTN_DR_US915_SF7);
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// ttn_set_max_tx_pow(14);
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if (ttn_resume_after_deep_sleep()) {
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printf("Resumed from deep sleep.\n");
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} else {
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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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}
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else
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{
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printf("Join failed. Goodbye\n");
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return;
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}
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}
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printf("Sending message...\n");
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counter_in_rtc_mem++;
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char message[20];
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sprintf(message, "Hello %d", counter_in_rtc_mem);
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ttn_response_code_t res = ttn_transmit_message((uint8_t *)message, strlen(message), 1, false);
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printf(res == TTN_SUCCESSFUL_TRANSMISSION ? "Message sent.\n" : "Transmission failed.\n");
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// Wait until TTN communication is idle and save state
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ttn_wait_for_idle();
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ttn_prepare_for_deep_sleep();
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// Schedule wake up
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esp_sleep_enable_timer_wakeup(TX_INTERVAL * 1000000LL);
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printf("Going to deep sleep...\n");
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esp_deep_sleep_start();
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}
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