Add esp32 mqtts capability

targets/esp32/.gitignore

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+.pio
+.vscode

targets/esp32/mqtts/.gitignore

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+.vscode

targets/esp32/mqtts/CMakeLists.txt

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+
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(mqtts)
+
+target_add_binary_data(${CMAKE_PROJECT_NAME}.elf "src/client.crt" TEXT)
+target_add_binary_data(${CMAKE_PROJECT_NAME}.elf "src/client.key" TEXT)
+target_add_binary_data(${CMAKE_PROJECT_NAME}.elf "src/mainflux.crt" TEXT)

targets/esp32/mqtts/include/cnetwork.h

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+#ifndef C_NETWORK_H
+#define C_NETWORK_H
+
+#include <string.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_mac.h"
+#include "esp_wifi.h"
+#include "esp_event.h"
+#include "esp_log.h"
+#include "nvs_flash.h"
+
+#include "lwip/err.h"
+#include "lwip/sys.h"
+
+static void wifi_event_handler(void *arg, esp_event_base_t event_base,
+                               int32_t event_id, void *event_data);
+
+void wifi_init_softap(void);
+
+#endif

targets/esp32/mqtts/include/config.h

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+#ifndef CONFIG_H
+#define CONFIG_H
+
+#define TOPIC_BUFFER_SIZE 128
+
+const char *mfThingId = " ";
+const char *mfThingPass = " ";
+const char *mfChannelId = " ";
+char mfTopic[TOPIC_BUFFER_SIZE];
+
+const char *server = " ";
+
+#endif

targets/esp32/mqtts/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32-c3-devkitc-02]
+platform = espressif32
+board = esp32-c3-devkitc-02
+framework = espidf

targets/esp32/mqtts/src/CMakeLists.txt

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+
+FILE(GLOB_RECURSE app_sources ${CMAKE_SOURCE_DIR}/src/*.*)
+
+idf_component_register(SRCS ${app_sources})

targets/esp32/mqtts/src/client.crt

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+Client certificate

targets/esp32/mqtts/src/client.key

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+client key

targets/esp32/mqtts/src/cnetwork.c

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+/**
+Implements a network interface for the esp.
+Current interface is wifi.
+**/
+
+#include "cnetwork.h"
+
+#define ESP_WIFI_SSID " " // Enter the wifi ssid
+#define ESP_WIFI_PASS " " // Enter the wifi password
+
+static const char *TAG = "wifi softAP"; // Tag for esp logging
+
+// Wi-Fi event handler
+static void wifi_event_handler(void *arg, esp_event_base_t event_base,
+                               int32_t event_id, void *event_data)
+{
+    if (event_id == WIFI_EVENT_AP_STACONNECTED)
+    {
+        wifi_event_ap_staconnected_t *event = (wifi_event_ap_staconnected_t *)event_data;
+        ESP_LOGI(TAG, "station " MACSTR " join, AID=%d",
+                 MAC2STR(event->mac), event->aid);
+    }
+    else if (event_id == WIFI_EVENT_AP_STADISCONNECTED)
+    {
+        wifi_event_ap_stadisconnected_t *event = (wifi_event_ap_stadisconnected_t *)event_data;
+        ESP_LOGI(TAG, "station " MACSTR " leave, AID=%d",
+                 MAC2STR(event->mac), event->aid);
+    }
+}
+
+// Wi-Fi init
+void wifi_init_softap(void)
+{
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_netif_create_default_wifi_ap();
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+
+    ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
+                                                        ESP_EVENT_ANY_ID,
+                                                        &wifi_event_handler,
+                                                        NULL,
+                                                        NULL));
+
+    wifi_config_t wifi_config = {
+        .ap = {
+            .ssid = ESP_WIFI_SSID,
+            .ssid_len = strlen(ESP_WIFI_SSID),
+            .password = ESP_WIFI_PASS,
+            .authmode = WIFI_AUTH_WPA2_PSK,
+            .pmf_cfg = {
+                .required = true,
+            },
+        },
+    };
+    if (strlen(ESP_WIFI_PASS) == 0)
+    {
+        wifi_config.ap.authmode = WIFI_AUTH_OPEN;
+    }
+
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
+    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &wifi_config));
+    ESP_ERROR_CHECK(esp_wifi_start());
+
+    ESP_LOGI(TAG, "wifi_init_softap finished. SSID:%s password:%s",
+             ESP_WIFI_SSID, ESP_WIFI_PASS); // Success log
+}

targets/esp32/mqtts/src/main.c

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+#include <stdio.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+#include "esp_wifi.h"
+#include "esp_system.h"
+#include "nvs_flash.h"
+#include "esp_event.h"
+#include "esp_netif.h"
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/semphr.h"
+#include "freertos/queue.h"
+
+#include "lwip/sockets.h"
+#include "lwip/dns.h"
+#include "lwip/netdb.h"
+
+#include "esp_log.h"
+#include "mqtt_client.h"
+#include "cnetwork.h"
+#include "config.h"
+
+#define CLIENT_ID "ESP32"
+
+static const char *TAG = "MQTTS_MAINFLUX";
+
+extern const uint8_t client_cert_pem_start[] asm("_binary_client_crt_start");
+extern const uint8_t client_cert_pem_end[] asm("_binary_client_crt_end");
+extern const uint8_t client_key_pem_start[] asm("_binary_client_key_start");
+extern const uint8_t client_key_pem_end[] asm("_binary_client_key_end");
+extern const uint8_t server_cert_pem_start[] asm("_binary_mainflux_crt_start");
+extern const uint8_t server_cert_pem_end[] asm("_binaty_mainflux_crt_end");
+
+static void log_error_if_nonzero(const char *message, int error_code)
+{
+    if (error_code != 0)
+    {
+        ESP_LOGE(TAG, "Last error %s: 0x%x", message, error_code);
+    }
+}
+void create_mainflux_channel(void)
+{
+    const char *_preId = "channels/";
+    const char *_postId = "/messages";
+    strcpy(mfTopic, _preId);
+    strcat(mfTopic, mfChannelId);
+    strcat(mfTopic, _postId);
+}
+
+static void mqtt_event_handler(void *handler_args, esp_event_base_t base, int32_t event_id, void *event_data)
+{
+    ESP_LOGD(TAG, "Event dispatched from event loop base=%s, event_id=%" PRIi32 "", base, event_id);
+    esp_mqtt_event_handle_t event = event_data;
+    esp_mqtt_client_handle_t client = event->client;
+    int msg_id;
+    create_mainflux_channel();
+    switch ((esp_mqtt_event_id_t)event_id)
+    {
+    case MQTT_EVENT_CONNECTED:
+        ESP_LOGI(TAG, "MQTT_EVENT_CONNECTED");
+        msg_id = esp_mqtt_client_publish(client, mfTopic, "'{'message':'hello mainflux'}", 0, 0, 0);
+        ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);
+
+        msg_id = esp_mqtt_client_subscribe(client, mfTopic, 0);
+        ESP_LOGI(TAG, "sent subscribe successful, msg_id=%d", msg_id);
+        break;
+    case MQTT_EVENT_DISCONNECTED:
+        ESP_LOGI(TAG, "MQTT_EVENT_DISCONNECTED");
+        break;
+    case MQTT_EVENT_SUBSCRIBED:
+        ESP_LOGI(TAG, "MQTT_EVENT_SUBSCRIBED, msg_id=%d", event->msg_id);
+        msg_id = esp_mqtt_client_publish(client, mfTopic, "'{'message':'hello mainflux'}", 0, 0, 0);
+        ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);
+        break;
+    case MQTT_EVENT_UNSUBSCRIBED:
+        ESP_LOGI(TAG, "MQTT_EVENT_UNSUBSCRIBED, msg_id=%d", event->msg_id);
+        break;
+    case MQTT_EVENT_PUBLISHED:
+        ESP_LOGI(TAG, "MQTT_EVENT_PUBLISHED, msg_id=%d", event->msg_id);
+        break;
+    case MQTT_EVENT_DATA:
+        ESP_LOGI(TAG, "MQTT_EVENT_DATA");
+        printf("TOPIC=%.*s\r\n", event->topic_len, event->topic);
+        printf("DATA=%.*s\r\n", event->data_len, event->data);
+        break;
+    case MQTT_EVENT_ERROR:
+        ESP_LOGI(TAG, "MQTT_EVENT_ERROR");
+        if (event->error_handle->error_type == MQTT_ERROR_TYPE_TCP_TRANSPORT)
+        {
+            log_error_if_nonzero("reported from esp-tls", event->error_handle->esp_tls_last_esp_err);
+            log_error_if_nonzero("reported from tls stack", event->error_handle->esp_tls_stack_err);
+            log_error_if_nonzero("captured as transport's socket errno", event->error_handle->esp_transport_sock_errno);
+            ESP_LOGI(TAG, "Last errno string (%s)", strerror(event->error_handle->esp_transport_sock_errno));
+        }
+        break;
+    default:
+        ESP_LOGI(TAG, "Other event id:%d", event->event_id);
+        break;
+    }
+}
+
+static void mqtt_app_start(void)
+{
+    esp_mqtt_client_config_t mqtt_cfg = {
+        .broker.address.uri = server,
+        .broker.verification.certificate = (const char *)server_cert_pem_start,
+        .credentials.client_id = CLIENT_ID,
+        .credentials.username = mfThingId,
+        .credentials.authentication.password = mfThingPass,
+        .credentials.authentication.certificate = (const char*)client_cert_pem_start,
+        .credentials.authentication.key = (const char*) client_key_pem_start,
+    };
+    esp_mqtt_client_handle_t client = esp_mqtt_client_init(&mqtt_cfg);
+    esp_mqtt_client_register_event(client, ESP_EVENT_ANY_ID, mqtt_event_handler, NULL);
+    esp_mqtt_client_start(client);
+}
+
+// Main app 
+void app_main(void)
+{
+    // Default start up logs for ESP-IDF
+    ESP_LOGI(TAG, "[APP] Startup..");
+    ESP_LOGI(TAG, "[APP] Free memory: %" PRIu32 " bytes", esp_get_free_heap_size());
+    ESP_LOGI(TAG, "[APP] IDF version: %s", esp_get_idf_version());
+    // Set log level
+    esp_log_level_set("*", ESP_LOG_INFO);
+    esp_log_level_set("mqtt_client", ESP_LOG_VERBOSE);
+    esp_log_level_set("TRANSPORT_BASE", ESP_LOG_VERBOSE);
+    esp_log_level_set("esp-tls", ESP_LOG_VERBOSE);
+    esp_log_level_set("TRANSPORT", ESP_LOG_VERBOSE);
+    esp_log_level_set("outbox", ESP_LOG_VERBOSE);
+    // Handle error on start up
+    ESP_ERROR_CHECK(nvs_flash_init());
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    // Run main task
+    wifi_init_softap();
+    mqtt_app_start();
+}

targets/esp32/mqtts/src/mainflux.crt

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+mainflux certificate