ARM JTAG 20 10 olimex ltd . Sockets & Adapters JTAG 20 PIN 0.1" TO 10 PIN 0.05" ADAPTER ARM USB OCD H, ARM USB TINY H JLINK V9 V|pin pin|pin 20jtag pins - AliExpress
GoJimmyPi: ESP8266 JTAG Debugging in Visual Studio with Olimex ARM-USB-OCD-H and Sysprogs VisualGDB