They all have JTAG output, though it isn't widely documented due to agreements with the Segger debugger. The nrf52-dk is a good choice, since it will natively run espruino as well.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
They all have JTAG output, though it isn't widely documented due to agreements with the Segger debugger. The nrf52-dk is a good choice, since it will natively run espruino as well.