Example for C

examples/hello_world/CMakeLists.txt

@@ -5,4 +5,6 @@ include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 # 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(hello_world)

examples/hello_world_in_c/CMakeLists.txt

@@ -0,0 +1,10 @@
+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(hello_world)

examples/hello_world_in_c/Makefile

@@ -0,0 +1,5 @@
+PROJECT_NAME := hello_world
+
+EXTRA_COMPONENT_DIRS := $(abspath ../..)
+
+include $(IDF_PATH)/make/project.mk

examples/hello_world_in_c/main/CMakeLists.txt

@@ -0,0 +1,4 @@
+idf_component_register(
+    SRCS "main.c"
+    INCLUDE_DIRS "."
+    REQUIRES ttn-esp32)

examples/hello_world_in_c/main/main.c

@@ -0,0 +1,113 @@
+/*******************************************************************************
+ * 
+ * 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 for C showing how to send and receive messages.
+ *******************************************************************************/
+
+#include "freertos/FreeRTOS.h"
+#include "esp_event.h"
+#include "driver/gpio.h"
+#include "nvs_flash.h"
+
+#include "ttn.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
+
+#define TX_INTERVAL 30
+static uint8_t msgData[] = "Hello, world";
+
+
+void sendMessages(void* pvParameter)
+{
+    while (1) {
+        printf("Sending message...\n");
+        ttn_response_code_t res = ttn_transmit_message(msgData, sizeof(msgData) - 1, 1, false);
+        printf(res == TTN_SUCCESSFUL_TRANSMISSION ? "Message sent.\n" : "Transmission failed.\n");
+
+        vTaskDelay(TX_INTERVAL * pdMS_TO_TICKS(1000));
+    }
+}
+
+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");
+}
+
+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 = {
+        .miso_io_num = TTN_PIN_SPI_MISO,
+        .mosi_io_num = TTN_PIN_SPI_MOSI,
+        .sclk_io_num = TTN_PIN_SPI_SCLK,
+        .quadwp_io_num = -1,
+        .quadhd_io_num = -1
+    }; 
+    err = spi_bus_initialize(TTN_SPI_HOST, &spi_bus_config, TTN_SPI_DMA_CHAN);
+    ESP_ERROR_CHECK(err);
+
+    // Initialize TTN
+    ttn_init();
+
+    // Configure the SX127x pins
+    ttn_configure_pins(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_on_message(messageReceived);
+
+    printf("Joining...\n");
+    if (ttn_join_provisioned())
+    {
+        printf("Joined.\n");
+        xTaskCreate(sendMessages, "send_messages", 1024 * 4, (void* )0, 3, NULL);
+    }
+    else
+    {
+        printf("Join failed. Goodbye\n");
+    }
+}