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ESP32DevelopmentBoardSecure.ino
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ESP32DevelopmentBoardSecure.ino
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// This example uses an ESP32 Development Board
// to connect to shiftr.io.
//
// You can check on your device after a successful
// connection here: https://www.shiftr.io/try.
//
// by Joël Gähwiler
// https://github.com/256dpi/arduino-mqtt
#include <WiFiClientSecure.h>
#include <MQTT.h>
const char ssid[] = "ssid";
const char pass[] = "pass";
WiFiClientSecure net;
MQTTClient client;
unsigned long lastMillis = 0;
void connect() {
Serial.print("checking wifi...");
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(1000);
}
Serial.print("\nconnecting...");
// do not verify tls certificate
// check the following example for methods to verify the server:
// https://github.com/espressif/arduino-esp32/blob/master/libraries/WiFiClientSecure/examples/WiFiClientSecure/WiFiClientSecure.ino
net.setInsecure();
while (!client.connect("arduino", "public", "public")) {
Serial.print(".");
delay(1000);
}
Serial.println("\nconnected!");
client.subscribe("/hello");
// client.unsubscribe("/hello");
}
void messageReceived(String &topic, String &payload) {
Serial.println("incoming: " + topic + " - " + payload);
// Note: Do not use the client in the callback to publish, subscribe or
// unsubscribe as it may cause deadlocks when other things arrive while
// sending and receiving acknowledgments. Instead, change a global variable,
// or push to a queue and handle it in the loop after calling `client.loop()`.
}
void setup() {
Serial.begin(115200);
WiFi.begin(ssid, pass);
// Note: Local domain names (e.g. "Computer.local" on OSX) are not supported
// by Arduino. You need to set the IP address directly.
//
// MQTT brokers usually use port 8883 for secure connections.
client.begin("public.cloud.shiftr.io", 8883, net);
client.onMessage(messageReceived);
connect();
}
void loop() {
client.loop();
delay(10); // <- fixes some issues with WiFi stability
if (!client.connected()) {
connect();
}
// publish a message roughly every second.
if (millis() - lastMillis > 1000) {
lastMillis = millis();
client.publish("/hello", "world");
}
}