[BUG] rpmsg tty transport works with python serial transport but not with c++ serial

[Hadatko]

Describe the bug

Due to efficient rpmsg transport counts that all data will be received at once. Python serial is sending all data at once (frame header + body). C++ serial is sending header first and then body. I think we should fix rpmsg to count with that and improve serial to be similar as python implementation

To Reproduce

send message from serial side to rpmsg tty side.

Expected behavior

Rpmsg should receive all data

Screenshots

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Steps you didn't forgot to do

• I checked if there is no related issue opened/closed.
• I checked that there doesn't exist opened PR which is solving this issue.

Additional context

[Hadatko]

PR was merged