Wio link personal custom code (with PlatformIO)

Install PlatformIO-cli (should be in /home/hoel/.platformio/penv/bin/platformio).
Have the Wio_link.sublime-project file loaded in subl, or re-create it with pio project init --ide sublimetext.
In sublime-text: Menu > Tools > Build System > PlatformIO, then build or upload.
For serial monitor: /home/hoel/.platformio/penv/bin/platformio device monitor -b 115200.

Interesting links:

https://github.com/Seeed-Studio/Wio_Link/wiki/Advanced-User-Guide#6-use-wio-link-offline