Changing upstream TCP packets on the fly

drasko.draskovic · 2019-03-25T07:02:00+00:00

We are implementing an MQTT client in OpenResty. It will listen for events on some topics, gather that data and transmit it towards a backend via HTTP re...

Changing upstream TCP packets on the fly

drasko.draskovic

I am using OpenResty as a TCP (stream) proxy. I have been capable to read TCP packets using reqsock:peek and preread_by_lua_block directives.

However, would like to change certain bytes of the TCP packet as it flows though the proxy, so that the service behind gets a changed packet.

Is this possible to achieve with ngx_stream_lua_module and how?

Best regards,

Drasko