Uses Bluetooth Low Energy (BLE) client to allow the M5Stack to remotely display the screen output and to control the functions of an Owon B35T multi-meter.
Please note:
Current arduino-esp32 git (14.05.2018) allows you to choose partiton scheme from Arduino IDE->Tools->Partition Scheme,
it is important to change this from default to minimal_spiffs or no_ota,
because the size of the binary file exceeds the allowable value in the default partition.
2018 Reaper7
I publish this sketch as it is. I do not have free time to clean it up and polish.
If you like it, buy me a beer: (https://www.paypal.me/reaper7md)