at_tcpclient_recv sends data back asynchrously filling arduino buffers

[aalku]

I wish to get the received data synchronously and with desired max buffer lenght. I know the AT firmware would need to buffer the received data itself to get this behaivour but that is much harder for arduino with 2KB of data memory.
There may exist asynchronous recv notifications but with no data, only notification of mux so it does not fill receiver buffers.