This code can recieve data form Ubidots
But I don't know how show data on Dot matrix (MD_MAX72xx)
Plese help me bro.
#include <WiFi.h>
#include <PubSubClient.h>
#define WIFISSID "xxxxxx"
#define PASSWORD "xxxxxx"
#define TOKEN "xxxxxx"
#define MQTT_CLIENT_NAME "Put_your_MQTT_client_name_here"
#define VARIABLE_LABEL_SUBSCRIBE "xxxxxx"
#define DEVICE_LABEL "xxxxxx"
#define RELAY 16
char mqttBroker[] = "industrial.api.ubidots.com";
char payload[100];
char topic[150];
char topicSubscribe[100];
WiFiClient ubidots;
PubSubClient client(ubidots);
void callback(char* topic, byte* payload, unsigned int length) {
char p[length + 1];
memcpy(p, payload, length);
p[length] = NULL;
String message(p);
if (message == "0") {
digitalWrite(RELAY, LOW);
} else {
digitalWrite(RELAY, HIGH);
}
Serial.write(payload, length);
Serial.println();
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.println("Attempting MQTT connection...");
// Attemp to connect
if (client.connect(MQTT_CLIENT_NAME, TOKEN, "")) {
Serial.println("Connected");
client.subscribe(topicSubscribe);
} else {
Serial.print("Failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 2 seconds");
// Wait 2 seconds before retrying
delay(2000);
}
}
}
/****************************************
- Main Functions
****************************************/
void setup() {
Serial.begin(115200);
WiFi.begin(WIFISSID, PASSWORD);
// Assign the pin as OUTPUT
pinMode(RELAY, OUTPUT);
Serial.println();
Serial.print("Wait for WiFi...");
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.println("");
Serial.println("WiFi Connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
client.setServer(mqttBroker, 1883);
client.setCallback(callback);
sprintf(topicSubscribe, "/v1.6/devices/%s/%s/lv", DEVICE_LABEL, VARIABLE_LABEL_SUBSCRIBE);
client.subscribe(topicSubscribe);
}
void loop() {
if (!client.connected()) {
reconnect();
client.subscribe(topicSubscribe);
}
client.loop();
}