drivers: wifi: esp: always request MRU bytes with AT+CIPRECVDATA
ESP chip send number of available RX data using
+IPD=<sock>,<avail_bytes> command. This exact number (truncated to MRU)
was used to read data with AT+CIPRECVDATA=<sock>,<num_of_bytes>.
Use always MRU when sending AT+CIPRECVDATA=<sock>,<mru> request. When
there are less bytes available, then +CIPRECVDATA will just return less
bytes, which is fine for the driver.
There are two advantages to this new behavior:
* there is no need to follow how many bytes were notified by +IPD
message, thus reducing implementation size,
* when data is constantly received by ESP chip, then the last number of
bytes notified by +IPD is no longer up-to-date when sending a
AT+CIPRECVDATA; always requesting MRU number of bytes allows to
always receive maximum currently available number of bytes buffered
by ESP chip.
Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
3 files changed
