Ok ! Works better with the new firmware.
I uploaded the 5.6.6 firmware.
Setting up pulse time doesn't work for know. I will checkout the codes needed.

[2018-09-24T18:45:44.810 CEST DEBG ][ org.kde.kstars.indi] - Avalon StarGo : "[DEBUG] sendQuery :X2040# End:# Wait:2s "
[2018-09-24T18:45:46.777 CEST INFO ][ org.kde.kstars.indi] - Avalon StarGo : "[WARNING] Failed to receive full response: Timeout error. (Return code: -4) "
[2018-09-24T18:45:46.781 CEST INFO ][ org.kde.kstars.indi] - Avalon StarGo : "[INFO] Setting RA speed to 40%. "
[2018-09-24T18:45:46.782 CEST DEBG ][ org.kde.kstars.indi] - Avalon StarGo : "[DEBUG] sendQuery :X2140# End:# Wait:2s "

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