Particle Photon and DS18B20 Temp Sensor

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@Tim_G_Tech I found my mistake. I was putting in the wrong value for client ID. Try this code, it will just increment a temp widget.

// This #include statement was automatically added by the Particle IDE.
#include <DS18B20.h>
//DS18B20 ds18b20(D0);
// This #include statement was automatically added by the Particle IDE.
#include <MQTT.h>
void callback(char* topic, byte* payload, unsigned int length);
String username = "";
String password = "";
String clientID = "";
MQTT client("mqtt.mydevices.com", 1883, callback);
// recieve message
void callback(char* topic, byte* payload, unsigned int length) {
    char p[length + 1];
    memcpy(p, payload, length);
    p[length] = NULL;
    if (!strcmp(p, "RED"))
        RGB.color(255, 0, 0);
    else if (!strcmp(p, "GREEN"))
        RGB.color(0, 255, 0);
    else if (!strcmp(p, "BLUE"))
        RGB.color(0, 0, 255);
    else
        RGB.color(255, 255, 255);
    delay(1000);
}
void setup() {
    Serial.begin(9600);
    delay(5000); // Allow board to settle
    client.connect(clientID, username, password);
}
int counter = 0;
void loop() {
    counter = counter + 1;
    
    if (client.isConnected()){
        Particle.publish("connected");
        client.loop();
    
        String mesasge = "temp,f=" + String(counter);
    
        client.publish("v1/" + username + "/things/" + clientID + "/data/1", mesasge);
    }
    
    delay(2000);
}
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