"...Curl, No. It is the API frame that determines the packet length. One the full frame is received, it is processed..."
Eric, thank you for your response, but I don't ask about the packet length itself, but the packetization rules (if any) in API mode. My question refers to the possibility (or not) of a frame being transmitted fragmented. I do not think so. For example. what happens if I try to send 60 bytes with pause (30 bytes, 1 second pause and 30 more bytes)?
Or to send the module 500 bytes before the checksum (module's input buffer size here)?