da660b234c
Use device cert/key embedded in firmware, or loaded from filesystem.
368 lines
13 KiB
C
368 lines
13 KiB
C
/*
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* Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* Additions Copyright 2016 Espressif Systems (Shanghai) PTE LTD
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*
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*
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* Licensed under the Apache License, Version 2.0 (the "License").
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* You may not use this file except in compliance with the License.
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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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/**
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* @file thing_shadow_sample.c
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* @brief A simple connected window example demonstrating the use of Thing Shadow
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*
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* See example README for more details.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <limits.h>
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#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/event_groups.h"
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#include "esp_system.h"
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#include "esp_wifi.h"
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#include "esp_event_loop.h"
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#include "esp_log.h"
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#include "esp_vfs_fat.h"
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#include "driver/sdmmc_host.h"
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#include "aws_iot_config.h"
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#include "aws_iot_log.h"
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#include "aws_iot_version.h"
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#include "aws_iot_mqtt_client_interface.h"
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#include "aws_iot_shadow_interface.h"
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/*!
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* The goal of this sample application is to demonstrate the capabilities of shadow.
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* This device(say Connected Window) will open the window of a room based on temperature
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* It can report to the Shadow the following parameters:
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* 1. temperature of the room (double)
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* 2. status of the window (open or close)
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* It can act on commands from the cloud. In this case it will open or close the window based on the json object "windowOpen" data[open/close]
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*
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* The two variables from a device's perspective are double temperature and bool windowOpen
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* The device needs to act on only on windowOpen variable, so we will create a primitiveJson_t object with callback
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The Json Document in the cloud will be
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{
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"reported": {
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"temperature": 0,
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"windowOpen": false
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},
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"desired": {
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"windowOpen": false
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}
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}
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*/
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static const char *TAG = "shadow";
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#define ROOMTEMPERATURE_UPPERLIMIT 32.0f
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#define ROOMTEMPERATURE_LOWERLIMIT 25.0f
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#define STARTING_ROOMTEMPERATURE ROOMTEMPERATURE_LOWERLIMIT
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#define MAX_LENGTH_OF_UPDATE_JSON_BUFFER 200
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/* The examples use simple WiFi configuration that you can set via
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'make menuconfig'.
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If you'd rather not, just change the below entries to strings with
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the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
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*/
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#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
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#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD
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/* FreeRTOS event group to signal when we are connected & ready to make a request */
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static EventGroupHandle_t wifi_event_group;
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/* The event group allows multiple bits for each event,
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but we only care about one event - are we connected
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to the AP with an IP? */
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const int CONNECTED_BIT = BIT0;
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/* CA Root certificate, device ("Thing") certificate and device
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* ("Thing") key.
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Example can be configured one of two ways:
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"Embedded Certs" are loaded from files in "certs/" and embedded into the app binary.
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"Filesystem Certs" are loaded from the filesystem (SD card, etc.)
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See example README for more details.
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*/
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#if defined(CONFIG_EXAMPLE_EMBEDDED_CERTS)
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extern const uint8_t aws_root_ca_pem_start[] asm("_binary_aws_root_ca_pem_start");
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extern const uint8_t aws_root_ca_pem_end[] asm("_binary_aws_root_ca_pem_end");
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extern const uint8_t certificate_pem_crt_start[] asm("_binary_certificate_pem_crt_start");
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extern const uint8_t certificate_pem_crt_end[] asm("_binary_certificate_pem_crt_end");
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extern const uint8_t private_pem_key_start[] asm("_binary_private_pem_key_start");
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extern const uint8_t private_pem_key_end[] asm("_binary_private_pem_key_end");
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#elif defined(CONFIG_EXAMPLE_FILESYSTEM_CERTS)
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static const char * DEVICE_CERTIFICATE_PATH = CONFIG_EXAMPLE_CERTIFICATE_PATH;
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static const char * DEVICE_PRIVATE_KEY_PATH = CONFIG_EXAMPLE_PRIVATE_KEY_PATH;
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static const char * ROOT_CA_PATH = CONFIG_EXAMPLE_ROOT_CA_PATH;
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#else
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#error "Invalid method for loading certs"
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#endif
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/**
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* @brief Default MQTT HOST URL is pulled from the aws_iot_config.h which
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* uses menuconfig to find a default.
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*/
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char HostAddress[255] = AWS_IOT_MQTT_HOST;
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/**
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* @brief Default MQTT port is pulled from the aws_iot_config.h which
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* uses menuconfig to find a default.
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*/
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uint32_t port = AWS_IOT_MQTT_PORT;
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static esp_err_t event_handler(void *ctx, system_event_t *event)
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{
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switch(event->event_id) {
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case SYSTEM_EVENT_STA_START:
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esp_wifi_connect();
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break;
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case SYSTEM_EVENT_STA_GOT_IP:
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xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
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break;
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case SYSTEM_EVENT_STA_DISCONNECTED:
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/* This is a workaround as ESP32 WiFi libs don't currently
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auto-reassociate. */
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esp_wifi_connect();
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xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
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break;
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default:
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break;
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}
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return ESP_OK;
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}
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static void simulateRoomTemperature(float *pRoomTemperature) {
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static float deltaChange;
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if(*pRoomTemperature >= ROOMTEMPERATURE_UPPERLIMIT) {
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deltaChange = -0.5f;
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} else if(*pRoomTemperature <= ROOMTEMPERATURE_LOWERLIMIT) {
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deltaChange = 0.5f;
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}
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*pRoomTemperature += deltaChange;
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}
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static bool shadowUpdateInProgress;
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void ShadowUpdateStatusCallback(const char *pThingName, ShadowActions_t action, Shadow_Ack_Status_t status,
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const char *pReceivedJsonDocument, void *pContextData) {
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IOT_UNUSED(pThingName);
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IOT_UNUSED(action);
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IOT_UNUSED(pReceivedJsonDocument);
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IOT_UNUSED(pContextData);
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shadowUpdateInProgress = false;
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if(SHADOW_ACK_TIMEOUT == status) {
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ESP_LOGE(TAG, "Update timed out");
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} else if(SHADOW_ACK_REJECTED == status) {
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ESP_LOGE(TAG, "Update rejected");
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} else if(SHADOW_ACK_ACCEPTED == status) {
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ESP_LOGI(TAG, "Update accepted");
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}
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}
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void windowActuate_Callback(const char *pJsonString, uint32_t JsonStringDataLen, jsonStruct_t *pContext) {
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IOT_UNUSED(pJsonString);
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IOT_UNUSED(JsonStringDataLen);
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if(pContext != NULL) {
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ESP_LOGI(TAG, "Delta - Window state changed to %d", *(bool *) (pContext->pData));
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}
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}
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void aws_iot_task(void *param) {
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IoT_Error_t rc = FAILURE;
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char JsonDocumentBuffer[MAX_LENGTH_OF_UPDATE_JSON_BUFFER];
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size_t sizeOfJsonDocumentBuffer = sizeof(JsonDocumentBuffer) / sizeof(JsonDocumentBuffer[0]);
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float temperature = 0.0;
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bool windowOpen = false;
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jsonStruct_t windowActuator;
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windowActuator.cb = windowActuate_Callback;
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windowActuator.pData = &windowOpen;
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windowActuator.pKey = "windowOpen";
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windowActuator.type = SHADOW_JSON_BOOL;
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jsonStruct_t temperatureHandler;
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temperatureHandler.cb = NULL;
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temperatureHandler.pKey = "temperature";
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temperatureHandler.pData = &temperature;
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temperatureHandler.type = SHADOW_JSON_FLOAT;
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ESP_LOGI(TAG, "AWS IoT SDK Version %d.%d.%d-%s", VERSION_MAJOR, VERSION_MINOR, VERSION_PATCH, VERSION_TAG);
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// initialize the mqtt client
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AWS_IoT_Client mqttClient;
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ShadowInitParameters_t sp = ShadowInitParametersDefault;
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sp.pHost = AWS_IOT_MQTT_HOST;
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sp.port = AWS_IOT_MQTT_PORT;
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#if defined(CONFIG_EXAMPLE_EMBEDDED_CERTS)
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sp.pClientCRT = (const char *)certificate_pem_crt_start;
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sp.pClientKey = (const char *)private_pem_key_start;
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sp.pRootCA = (const char *)aws_root_ca_pem_start;
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#elif defined(CONFIG_EXAMPLE_FILESYSTEM_CERTS)
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sp.pClientCRT = DEVICE_CERTIFICATE_PATH;
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sp.pClientKey = DEVICE_PRIVATE_KEY_PATH;
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sp.pRootCA = ROOT_CA_PATH;
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#endif
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sp.enableAutoReconnect = false;
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sp.disconnectHandler = NULL;
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#ifdef CONFIG_EXAMPLE_SDCARD_CERTS
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ESP_LOGI(TAG, "Mounting SD card...");
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sdmmc_host_t host = SDMMC_HOST_DEFAULT();
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sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
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esp_vfs_fat_sdmmc_mount_config_t mount_config = {
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.format_if_mount_failed = false,
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.max_files = 3,
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};
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sdmmc_card_t* card;
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esp_err_t ret = esp_vfs_fat_sdmmc_mount("/sdcard", &host, &slot_config, &mount_config, &card);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to mount SD card VFAT filesystem.");
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abort();
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}
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#endif
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/* Wait for WiFI to show as connected */
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xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
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false, true, portMAX_DELAY);
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ESP_LOGI(TAG, "Shadow Init");
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rc = aws_iot_shadow_init(&mqttClient, &sp);
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if(SUCCESS != rc) {
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ESP_LOGE(TAG, "aws_iot_shadow_init returned error %d, aborting...", rc);
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abort();
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}
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ShadowConnectParameters_t scp = ShadowConnectParametersDefault;
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scp.pMyThingName = CONFIG_AWS_EXAMPLE_THING_NAME;
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scp.pMqttClientId = CONFIG_AWS_EXAMPLE_CLIENT_ID;
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scp.mqttClientIdLen = (uint16_t) strlen(CONFIG_AWS_EXAMPLE_CLIENT_ID);
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ESP_LOGI(TAG, "Shadow Connect");
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rc = aws_iot_shadow_connect(&mqttClient, &scp);
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if(SUCCESS != rc) {
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ESP_LOGE(TAG, "aws_iot_shadow_connect returned error %d, aborting...", rc);
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abort();
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}
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/*
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* Enable Auto Reconnect functionality. Minimum and Maximum time of Exponential backoff are set in aws_iot_config.h
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* #AWS_IOT_MQTT_MIN_RECONNECT_WAIT_INTERVAL
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* #AWS_IOT_MQTT_MAX_RECONNECT_WAIT_INTERVAL
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*/
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rc = aws_iot_shadow_set_autoreconnect_status(&mqttClient, true);
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if(SUCCESS != rc) {
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ESP_LOGE(TAG, "Unable to set Auto Reconnect to true - %d, aborting...", rc);
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abort();
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}
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rc = aws_iot_shadow_register_delta(&mqttClient, &windowActuator);
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if(SUCCESS != rc) {
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ESP_LOGE(TAG, "Shadow Register Delta Error");
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}
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temperature = STARTING_ROOMTEMPERATURE;
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// loop and publish a change in temperature
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while(NETWORK_ATTEMPTING_RECONNECT == rc || NETWORK_RECONNECTED == rc || SUCCESS == rc) {
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rc = aws_iot_shadow_yield(&mqttClient, 200);
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if(NETWORK_ATTEMPTING_RECONNECT == rc || shadowUpdateInProgress) {
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rc = aws_iot_shadow_yield(&mqttClient, 1000);
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// If the client is attempting to reconnect, or already waiting on a shadow update,
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// we will skip the rest of the loop.
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continue;
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}
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ESP_LOGI(TAG, "=======================================================================================");
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ESP_LOGI(TAG, "On Device: window state %s", windowOpen ? "true" : "false");
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simulateRoomTemperature(&temperature);
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rc = aws_iot_shadow_init_json_document(JsonDocumentBuffer, sizeOfJsonDocumentBuffer);
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if(SUCCESS == rc) {
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rc = aws_iot_shadow_add_reported(JsonDocumentBuffer, sizeOfJsonDocumentBuffer, 2, &temperatureHandler,
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&windowActuator);
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if(SUCCESS == rc) {
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rc = aws_iot_finalize_json_document(JsonDocumentBuffer, sizeOfJsonDocumentBuffer);
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if(SUCCESS == rc) {
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ESP_LOGI(TAG, "Update Shadow: %s", JsonDocumentBuffer);
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rc = aws_iot_shadow_update(&mqttClient, CONFIG_AWS_EXAMPLE_THING_NAME, JsonDocumentBuffer,
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ShadowUpdateStatusCallback, NULL, 4, true);
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shadowUpdateInProgress = true;
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}
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}
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}
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ESP_LOGI(TAG, "*****************************************************************************************");
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vTaskDelay(1000 / portTICK_RATE_MS);
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}
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if(SUCCESS != rc) {
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ESP_LOGE(TAG, "An error occurred in the loop %d", rc);
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}
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ESP_LOGI(TAG, "Disconnecting");
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rc = aws_iot_shadow_disconnect(&mqttClient);
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if(SUCCESS != rc) {
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ESP_LOGE(TAG, "Disconnect error %d", rc);
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}
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vTaskDelete(NULL);
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}
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static void initialise_wifi(void)
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{
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tcpip_adapter_init();
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wifi_event_group = xEventGroupCreate();
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ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) );
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
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ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
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wifi_config_t wifi_config = {
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.sta = {
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.ssid = EXAMPLE_WIFI_SSID,
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.password = EXAMPLE_WIFI_PASS,
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},
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};
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ESP_LOGI(TAG, "Setting WiFi configuration SSID %s...", wifi_config.sta.ssid);
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ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
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ESP_ERROR_CHECK( esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
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ESP_ERROR_CHECK( esp_wifi_start() );
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}
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void app_main()
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{
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initialise_wifi();
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/* Temporarily pin task to core, due to FPU uncertainty */
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xTaskCreatePinnedToCore(&aws_iot_task, "aws_iot_task", 16384+1024, NULL, 5, NULL, 1);
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}
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