- https://github.com/m5stack/M5StickC-Plus
- https://github.com/electricidea/M5StickC-TB_Display
- https://github.com/m5stack/M5Unit-ENV
- https://github.com/m5stack/M5-DLight
- https://github.com/m5stack/M5Unit-PoESP32/blob/master/examples/Unit_PoESP32_M5StickCPlus/TCP_CLIENT/TCP_CLIENT.ino
- https://github.com/arduino-libraries/ArduinoBLE/tree/master/examples
## add
make examples/$new_application
## switch
make switch/env_hat