如何从ThingsBoard编写中获取返回代码？

Question

我使用Arduino设备创建了温度传感器，该设备将温度数据写入我的ThingsBoard服务器。一切工作正常，但是我想向草图中添加一个片段，以从ThingsBoard服务器获取返回代码并将其打印到串行监视器（出于调试目的）。谁能指出我正确的方向？

这是草图的相关部分：

float t = sht30.cTemp;
float h = sht30.humidity;

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

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

// Send payload
char attributes[100];
payload.toCharArray( attributes, 100 );
clientPsTB.publish( "v1/devices/me/telemetry", attributes );

我尝试将最后一行替换为：

int returnCodeTB = clientPsTB.publish( "v1/devices/me/telemetry", attributes );

Serial.print( "ThingsBoard Return Code: " );
Serial.println(returnCodeTB);

但这只是吐出“ 1”，所以我认为那是不正确的。