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Am 10.10.2020 um 08:51 schrieb Sean Conner:
It was thus said that the Great Ulrich Schmidt once stated:
I can open the serial port via but this approach works in
buffered mode and my short messages get stuck in the transmit buffer.

   Two possible solutions:

1. use file:flush() after writing data to ensure the buffer is written.
2. use file:setvbuf('no') immediately after opening the serial port to avoid
    all buffering of data.

   -spc (And that's all the ideas I have)

Solution 2. worked so far as i can send short commands to my hardware.
Thank You. For doing so, i had to open the file in write mode.
Unfortunately i cant read this port. To read, i need to open the file in
read mode but cant send anymore.
Thats probably the reason Steve Donovan did a lot of magic behind the
scene in his winapi module.