Giovanni, while checking the FAQ I saw another mention of the forum search being broken, googled that and stumbled to: https://www.phpbb.com/community/viewtopic.php?f=46&t=1282045 Probably you have already seen and tried that, but won't hurt posting, after all a useful search will lower the amou...
I recall I was losing data on the serial port too on 115200, worked fine with 57600 and was not an overflow issue too. Gave up on it and continued to use 57600 for the time being, not that it helps tho, but mentioning, it was way back.
Dunno, I'll go for it when time comes :) I mean it does cache data, so in command mode you read byte by byte to get the line end and command response, in data mode... well depends, some modems notify you about leaving data mode with ETX, so you again read byte by byte and interrupt when ETX is recei...
I may need to do it later this year. Uart/serial - does it matter really? Uart had less overhed I think, serail will be easier for the commands, but unless you are shooting for some very high transfer speeds...