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ArduinoMKRGSM1400.ino
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ArduinoMKRGSM1400.ino
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// This example uses an Arduino MKR GSM 1400 board
// to connect to shiftr.io.
//
// IMPORTANT: This example uses the new MKRGSM library.
//
// You can check on your device after a successful
// connection here: https://www.shiftr.io/try.
//
// by Sandeep Mistry
// https://github.com/256dpi/arduino-mqtt
#include <MKRGSM.h>
#include <MQTT.h>
const char pin[] = "";
const char apn[] = "apn";
const char login[] = "login";
const char password[] = "password";
GSMClient net;
GPRS gprs;
GSM gsmAccess;
MQTTClient client;
unsigned long lastMillis = 0;
void connect() {
// connection state
bool connected = false;
Serial.print("connecting to cellular network ...");
// After starting the modem with gsmAccess.begin()
// attach to the GPRS network with the APN, login and password
while (!connected) {
if ((gsmAccess.begin(pin) == GSM_READY) &&
(gprs.attachGPRS(apn, login, password) == GPRS_READY)) {
connected = true;
} else {
Serial.print(".");
delay(1000);
}
}
Serial.print("\nconnecting...");
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);
// Note: Local domain names (e.g. "Computer.local" on OSX) are not supported
// by Arduino. You need to set the IP address directly.
client.begin("public.cloud.shiftr.io", net);
client.onMessage(messageReceived);
connect();
}
void loop() {
client.loop();
if (!client.connected()) {
connect();
}
// publish a message roughly every second.
if (millis() - lastMillis > 1000) {
lastMillis = millis();
client.publish("/hello", "world");
}
}