Websocket Client on Kinetis

stevenlutz — Wed, 04 Apr 2018 06:37:00 GMT

I need to make a websocket connection to a server from a K64F (or other K series MCU) to exchange JSON formatted data. I can't find an example of how this is done with FreeRTOS, Lwip, or the KSDK at all. All I can find are Websocket server examples.
Can someone please advise me of what I should ne looking for or if this is no possible?
I'm also tempted to try mongoose os.

Re: Websocket Client on Kinetis

danielchen — Mon, 09 Apr 2018 08:04:43 GMT

Hi Steven:

This should be possible but you will probably have to implement the client yourself.

There is no lwIP web socket client example in SDK. Just a server socket implementation in middleware\lwip\src\apps\httpsrv\httpsrv_ws.c.

I have found some client libraries which perhaps could be used as inspiration for lwIP / FreeRTOS implementation:

https://github.com/jeremyhahn/cwebsocket

https://github.com/dhbaird/easywsclient

https://github.com/warmcat/libwebsockets

https://github.com/contiki-os/contiki/blob/master/core/net/ipv6/websocket-http-client.c

https://github.com/payden/libwsclient

Regards

Daniel

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Websocket Client on Kinetis

Re: Websocket Client on Kinetis