In this video you can find brief overview in terms of how to make ESP-12E adapter PCB and
how to design basic TCP client-server ESP application.
Full TCP client-server application projects are available on the following Github repositories:
https://github.com/sigma-prj/esp-tcp-server
https://github.com/sigma-prj/esp-tcp-client
Adapter PCB Gerbers and KiCad project files are available at GitHub repository as well:
https://github.com/sigma-prj/esp-12-e-adapter-pcb