Websocket Client implementation

Simple Websocket Client using mbedtls tested on STM32F7

Features

• Sending and Receiving encrypted websocket data

Limitations

• No continuation frames
• Not parsing Server Handshake response
• No other Op Codes than "text"
• No random Nonce for handshake

Prerequisites

Set up a Project for your STM32 Microcontroller with LWip and mbedTLS For example:

• https://github.com/STMicroelectronics/STM32CubeF4/tree/master/Projects/STM324x9I_EVAL/Applications/mbedTLS/SSL_Client
• https://github.com/anon767/STM32F7HTTPS

Also you need:

• openssl
• golang (for the test websocket server)

Usage

1. Adjust the client.h
2. In your main.c

#include client.h

and call

SSL_Client();

Somewhere in you main();

3. Generate Cert/Key and build and start server

mkdir -p $GOPATH/src/github.com/anon767/wsserver
cp ./test_server.go $GOPATH/src/github.com/anon767/wsserver/wsserver.go
cd $GOPATH/src/github.com/anon767/wsserver
go get && go build
chmod +x wsserver
openssl req -newkey rsa:2048 -new -nodes -x509 -days 3650 -keyout key.pem -out cert.pem
./wsserver

4. Compile and Flash your device