Testing a Message Handler Custom Function
- headerMap = header.toMap();
- deviceid = headerMap.get("deviceid");
- receivedtime = headerMap.get("occurred_timestamp");
- topic = headerMap.get("topic");
- communication_status_flag = headerMap.get("data_internal");
- if(communication_status_flag == false && topic == "telemetry")
{ payload = message.toMap();
if(payload.containKey("data")) {
deviceMessage = payload.get("data");
}
else {
deviceMessage = payload;
}
else if(communication_status_flag == true) { deviceMessage = Map(); } return deviceMessage;
- Click the Save and Execute button in the top right. This will open the Execute Function dialogue box.
- Select Device Message in the Message Type field.
- Provide {'temp':25} in the Message field.
- Provide any value as Device ID since it is only for testing purpose.
- Click Save.
- new_temp = payload.get('temp')+5;
- deviceMessage = Map();
- deviceMessage.put('temp', new_temp);
Updated Code:
- headerMap = header.toMap();
- deviceid = headerMap.get("deviceid");
- receivedtime = headerMap.get("occurred_timestamp");
- topic = headerMap.get("topic");
- communication_status_flag = headerMap.get("data_internal");
- if(communication_status_flag == false && topic == "telemetry") { payload = message.toMap(); if(payload.containKey("data")) { deviceMessage = payload.get("dat } else { new_temp = payload.get('temp')+5; deviceMessage = Map(); deviceMessage.put('temp', new_temp); } else if(communication_status_flag == true) { deviceMessage = Map(); }
- return deviceMessage;
Once the code is updated,
Click Save and Execute in the top right.
Select Device Message in the Message Type field.
Provide {'temp':25} in the Message field.
Provide any value as Device ID since it is only for testing purpose.
Click Save.
The function will now be executed and the value {'temp':30} will be displayed as the output.
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