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AWSnodeMCU.ino
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AWSnodeMCU.ino
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/*
Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and associated documentation files (the "Software"), to deal in the Software
without restriction, including without limitation the rights to use, copy, modify,
merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "secrets.h"
#include <WiFiClientSecure.h>
#include <MQTTClient.h>
#include <ArduinoJson.h>
#include "WiFi.h"
// The MQTT topics that this device should publish/subscribe
#define AWS_IOT_PUBLISH_TOPIC "esp32/pub"
#define AWS_IOT_SUBSCRIBE_TOPIC "esp32/sub"
WiFiClientSecure net = WiFiClientSecure();
MQTTClient client = MQTTClient(256);
void connectAWS()
{
WiFi.mode(WIFI_STA);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
Serial.println("Connecting to Wi-Fi");
while (WiFi.status() != WL_CONNECTED){
delay(500);
Serial.print(".");
}
// Configure WiFiClientSecure to use the AWS IoT device credentials
net.setCACert(AWS_CERT_CA);
net.setCertificate(AWS_CERT_CRT);
net.setPrivateKey(AWS_CERT_PRIVATE);
// Connect to the MQTT broker on the AWS endpoint we defined earlier
client.begin(AWS_IOT_ENDPOINT, 8883, net);
// Create a message handler
client.onMessage(messageHandler);
Serial.print("Connecting to AWS IOT");
while (!client.connect(THINGNAME)) {
Serial.print(".");
delay(100);
}
if(!client.connected()){
Serial.println("AWS IoT Timeout!");
return;
}
// Subscribe to a topic
client.subscribe(AWS_IOT_SUBSCRIBE_TOPIC);
Serial.println("AWS IoT Connected!");
}
void publishMessage()
{
StaticJsonDocument<200> doc;
doc["time"] = millis();
doc["sensor_a0"] = analogRead(0);
char jsonBuffer[512];
serializeJson(doc, jsonBuffer); // print to client
client.publish(AWS_IOT_PUBLISH_TOPIC, jsonBuffer);
}
void messageHandler(String &topic, String &payload) {
Serial.println("incoming: " + topic + " - " + payload);
// StaticJsonDocument<200> doc;
// deserializeJson(doc, payload);
// const char* message = doc["message"];
}
void setup() {
Serial.begin(9600);
connectAWS();
}
void loop() {
publishMessage();
client.loop();
delay(1000);
}