[8K832d7tNmiQ]

I'm also seconding this, but from microcontroller perspective.

I want to try developing a simple tcp echo server for a microcontroller, but most examples just use the vendor's own tcp library and put no effort explaining how to manually setup and establish connection to the router.

[hanikesn]

Because implementing TCP not just as a toy is incredibly difficult with tripwires that even subject matter experts struggle to get it right without decades of in field testing.

[patmorgan23]

Well you can always read the standard