Excuse my English, I have to work with translators.

Hello, everybody,
I get messages about Fhem and request and send messages to Fhem as well.
Now I want to use Software-ACK and isAck() (new isEcho()) to make sure that the sent messages arrive.
Problem is, the requests and messages from Fhem do not contain Ack and the serial port goes into endless loop.
How can I check the messages in this regard (set, request)?

I have found a way:

message.getCommand()

As soon as all tests are positive, I will publish an example.

I found my solution here, first entry:
Sketch