Kai Morich's Android Apps
Serial USB Terminal
Google Play
USB troubleshooting
References:
Make Magazin 3/2018 - Neue Aufgaben für alte Smartphones
Serial Bluetooth Terminal
Google Play
Bluetooth LE troubleshooting
References:
ELV journal 06/2017 - Franzis Bluething Board
Conrad - Internet of Things Advent Calendar 2017
c't 1/2019 - Bluetooth-Shell für Raspberry Pi und Raspi Zero W
micro:bit - FAQ - Using the micro:bit Bluetooth Low Energy UART
Serial WiFi Terminal
Google Play