Good afternoon,
I am using the Arduino Library PubSubClient.
According to https://developers.mydevices.com/cayenne/docs/cayenne-mqtt-api/ it is possible to send multiple sensor variables to multiple channels simultaneously using
Topic: v1/ username /things/ clientID /data/
and Payload:
[
{
“channel”: 1,
“value”: 16.4,
“type”: “temp”,
“unit”: “c”
},
{
“channel”: 2,
“value”: 75,
“type”: “rel_hum”,
“unit”: “p”
},
{
“channel”: 5,
“value”: 75,
“type”: “batt”,
“unit”: “v”
}
]
I can not get it to work. I did manage to send sigle sensor values, one at a time
Attach my code:
//WiFi global declarations
#include <WiFi.h>
const char* ssid = "xxxx";
const char* password = "xxxx";
#include <PubSubClient.h>
//(String batcap,String tempgyro,String temp,String tilt,String batvolt,String grav,String abv, float signalstrength, String mqtt_username, String mqtt_password, String mqtt_clientid)
void pubToCayenne(String batcap,String tempgyro,String temp,String tilt,String batvolt,String grav,String abv, String signalstrength, String mqtt_username, String mqtt_password, String mqtt_client_id)
{
WiFiClient wifiClient; //MQTT things
PubSubClient client("mqtt.mydevices.com", 1883,wifiClient);
if (client.connect(mqtt_client_id.c_str(), mqtt_username.c_str(), mqtt_password.c_str()))
{
Serial.println("Connected to Cayenne");
}
delay(3000);
String topic="v1/" +mqtt_username +"/things/" +mqtt_client_id+"/data/";
String payload;
payload="[";
payload+="{\"channel\": 0,\"value\": "+String(000)+"}"; //iTilt id number
payload+=",{\"channel\": 1,\"value\": "+batcap+"}";
payload+=",{\"channel\": 2,\"value\": "+tempgyro+"}";
payload+=",{\"channel\": 3,\"value\": "+String(1.08)+"}"; //Firmware Version
payload+=",{\"channel\": 4,\"value\": "+temp+"}";
payload+=",{\"channel\": 5,\"value\": "+tilt+"}";
payload+=",{\"channel\": 6,\"value\": "+batvolt+"}";
payload+=",{\"channel\": 7,\"value\": "+grav+"}";
payload+=",{\"channel\": 8,\"value\": "+String(65)+"}"; //pub interval
payload+=",{\"channel\": 9,\"value\": "+String(1.055)+"}"; //original gravity
payload+=",{\"channel\": 10,\"value\": "+abv+"}";
payload+=",{\"channel\": 11,\"value\": "+signalstrength+"}";
payload+="]";
Serial.println("Topic: "+topic);
Serial.println("Payload: "+payload);
client.publish(topic.c_str(),payload.c_str());
delay(10000);
}
void setup() {
Serial.begin(115200);
WiFi.begin(ssid, password);
Serial.println("Try to connect to WiFi");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("WiFi Connected");
}
void loop() {
pubToCayenne("20","26","25","44","4.14","1.005","4.8","78","xxxxx","xxxxx","xxxxx");
ESP.deepSleep(60000000000);
}
Please advice.
