How to pause receiving uploads from client

[vuthaitdp1]

How to pause receiving uploads from client on buffer overflow until buffer is partially released (asyncTCP server)

[Vorms]

Good question.
I am concerned for.
I do Modbus transaction in RTU (serial) mode.
Some times, the esp32 miss receiving char and there is a timeout error in the transaction.
I know it's possible to change the priority of the task (from 3 to 1) but ther is no suffisiant for solving the problem.