I have just gone through a OS install to run ubuntu 18.04 and the latest indi 1.8.5 is for the most part setup.

So far with the roof Arduino connected I have not yet managed to reproduce the problem.

It is a clean install to the extent that no old libraries or 3rdparty programs were carried over. I did retain all the property settings in the home directory.

I sent Christophe a new roof driver source with the addition of a 1 second delay in the handshake routine to see if slowing it down a bit helps.

Sorry, I was unable to join in yesterday.
Success..... I reinstalled Indi and Kstars with the 2020-04-25 version and it all appears to be working again for me. Thanks Jasem for the work you have put in on this.
Constant 1462 I hope that this will solve your problems as well, your set up seems far more sophisticated than mine.
Hoping that the skies are kind tonight and I will be able to test it in the field.

Hello
Yesterday I wasn't here, so I updated the software yesterday, and everything is working perfectly again.

Thank you Jasem ! two updates in two days, great job and thanks again !

Take care of you
Christophe