Sorry I did not see your post before. TBH I dont remember what I changed exactly but it boiled down to some delay that had to be suppessed or added. This thing is pretty sensitive to how you handle the serial comm. For example code like: while (…) Serial.write(Serial1.read()); does not work. It looks like intertwinning calls to different serial ports (HW/SW) is not a good idea. So you need to use a small buffer in between.
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