Did not receive response for function 255 in time (-1)

[yvo]

Dear list

Some bricklets are used by services written as Python-scripts started automatically at the startup of the RaspberryPis were the applications are running. One of those bricklets is an IndustrialDualRelay.

At the start of the service / of the script, I am getting sometimes the following exception:

Exception during usage of DualRelay: Did not receive response for function 255 in time (-1)

Question:

• Can it be, that the service starts to early and the connection to the bricklet cannot be established?
• And do you have any suggestions?

Thank you advance for any ideas and hints.

Cheers. Yvo