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ESP8266: How to design custom ESP-12E PCB. Typical TCP client-server application. - YouTube
ESP8266 WiFi Module with PCB Antenna - ElectroPeak
nodemcu v3 esp8266 ch340 Wireless module Lua WIFI Internet of Things development board with pcb Antenna and usb port for Arduino|development board|esp8266 development board - AliExpress
Emulator with ESP8266 - bare PCB (150713-1) | Elektor
Design your own ESP Board for Battery Powered IoT Applications