QUERY · ISSUE

module wiznet5k server not disconnecting prior to close

openby t35tB0topened 2019-02-10updated 2019-02-22

port-stm32

When wiznet5K TCP sockets are being used as servers, client connections hang due to server closing socket without issuing proper FIN-ACK disconnect. Adding disconnect in the close() method fixes client handshake but breaks the socket del destructor method (system hangs, waits a long time for timeouts). The wiznet 5K socket disconnect method closes the socket but this command is never called (code pragma'd out).

CANDIDATE · PULL REQUEST

Add nonblocking support for WIZnet 5k NIC

openby greezybaconopened 2024-04-07updated 2024-08-21

extmod

This adds support for the WIZnet chip:

Non-blocking support (ie. settimeout(0) or setblocking(False))
DHCP runs in the background and will auto-renew the address or update it if the DHCP server assigns a different one
DHCP runs on a dynamic socket, so it won't corrupt other usage of socket #1
DNS runs on a dynamic socket, so it won't corrupt other usage of socket #2
Interrupt pin is supported
Sockets are otherwise polled on a 64ms interval (based on the lwIP-based interface)
send and recv is supported on UDP sockets. (send requires a call to connect)
TCP_NODELAY option is supported
Listener socket is automatically reinstated if no sockets are available when a client connection is accepted.

Using the WIZnet TCP/IP offload (without lwIP) reduces the code size by about 37k (on the RP2040), and static RAM usage by 28k.

module wiznet5k server not disconnecting prior to close

Add nonblocking support for WIZnet 5k NIC

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