检索在Thingsboard中发布的传感器数据时MQTT的正确语法

Question

因此，我已经能够成功地将传感器数据发布到事物板上，并使用MQTT（附加了我的INO代码）很好地读取了它们。

我一直在试图弄清楚如何正确地使用sub / pub语法现在将数据读回到另一个Arduino板上，在那里我将使用CO2传感器数据来控制我的AC单元（通过TriAC）。

我一直在尝试解密https://thingsboard.io/docs/samples/esp8266/gpio/处的示例（并剥离了GPIO部分），但是很遗憾没有成功。

这也是我传输CO2数据的方式：

Serial.print("Humidity: ");
Serial.print(h);
Serial.print(" %\t");
Serial.print("Temperature: ");
Serial.print(t);
Serial.print(" *C ");
Serial.print(", CO2 PPM: ");
Serial.println(c);

String temperature = String(t);
String humidity = String(h);
String carbonmonoxide = String(c);


// Just debug messages
Serial.print( "Sending temperature, humidity and CO2 : [" );
Serial.print( temperature ); Serial.print( "," );
Serial.print( humidity ); Serial.print( "," );
Serial.print( carbonmonoxide );
Serial.print( "]   -> " );

// Prepare a JSON payload string
String payload = "{";
payload += "\"temperature\":"; payload += temperature; payload += ",";
payload += "\"humidity\":"; payload += humidity; payload += ",";
payload += "\"CO2\":"; payload += carbonmonoxide;
payload += "}";

// Send payload
char attributes[100];
payload.toCharArray( attributes, 100 );
client.publish( "v1/devices/me/telemetry", attributes );
Serial.println( attributes );
delay(5000);