LEGO MINDSTORMS Robot Inventor's Hub to Hub Communication is implemented on Bluetooth LE (BLE) Advertising.

For example, when a hub transmits a signal named "ABC" with a value "123", some INVALID advertising packets will be sent as follows:

FF 03 97 01 48 03 83 A3 31 32 33

$ sudo hcitool -i hci0 cmd 0x08 0x0006 a0 00 a0 00 02 00 00 00 00 00 00 00 00 07 00
$ sudo hcitool -i hci0 cmd 0x08 0x0008 0b ff 03 97 01 48 03 83 a3 31 32 33
$ sudo hcitool -i hci0 cmd 0x08 0x000a 01
...
$ sudo hcitool -i hci0 cmd 0x08 0x000a 00

Ref. Bluetooth Core Specification Version 5.3, Vol 4, Part E, 7.8 LE Controller Commands

hub2hub.py is a Hub to Hub Communication library written by Python 3.7x for Raspberry Pi OS (and Linux). Usage as command:

$ sudo python3 hub2hub.py transmit <transmission-id> <signal-name> <value>

or

$ sudo python3 hub2hub.py receive

• https://www.youtube.com/watch?v=K0kwiPHDSnw
• Transmitter: Raspberry Pi Zero W
  • Python 3.7+ scrpit: raspberry-pi/transmitter.py importing hub2hub.py
  • Transmit signals named "ABC" with a counter value when pushing the button like this word block program
• Receiver: MINDSTORMS Hub
  • 

MicroPython v1.12 scripts for SPIKE Prime Hub OS 3.1.21.9

• Transmitter program: spike-prime/transmitter.py
• Receiver program: spike-prime/receiver.py
• TODO:
  • implement crc32()

WIP