receive_read_payload_and_next_header
err = receive_read_payload_and_next_header(ra, size, buf);
err = receive_read_payload_and_next_header(ra, 0, NULL);
err = receive_read_payload_and_next_header(ra,
err = receive_read_payload_and_next_header(ra, 0, NULL);
err = receive_read_payload_and_next_header(ra, size, buf);
err = receive_read_payload_and_next_header(ra, 0, NULL);
err = receive_read_payload_and_next_header(ra, len,
err = receive_read_payload_and_next_header(ra, 0, NULL);
err = receive_read_payload_and_next_header(&ra, payloadlen, payload);