BLE connection inquiry

[Leslie Leung]

I am trying to use AppInventor with my Microbit while I found both of them can communicate using BLE with extension.

But I have question in the following:
- i am not be to located my microbit MAC address
- when I start the BLE scanning, is there any method to return the available device in a list picker and I just click the device and return the MAC address to connect
- I am also a bit confused that the UUID generation and is that the mobile device dependent or it is unique from other program is good enough

[Neil Kenyon]

Hi @Leslie.

Here is the design and the blocks I use all the time to establish a connection to my micro:bit.

I have also attached the blocks for the simple .PXT program to load on to the micro:bit.

I hope these help.

When you want to actually communicate with the micro:bit, you must uses the UUIDs as published in the BLE Profile.

Neil

[Neil Kenyon]

@Leslie

Here are some links you might find useful:

https://lancaster-university.github.io/microbit-docs/resources/bluetooth/bluetooth_profile.html

https://lancaster-university.github.io/microbit-docs/ble/profile/#reference-documentation

Note that the UUIDs must include dashes "-"  in appropriate places, so that, for example:

E95D0753251D470AA062FA1922DFA9A8

becomes:

E95D0753-251D-470A-A062-FA1922DFA9A8

I hope this helps

Neil

[Ghica]

Great! I think ABG should add this to his FAQ.
One remark though.
I do not like this 1-17 thing. You could also code this as the blocks below.

Cheers, Ghica.

[Abraham Getzler]

(added to FAQ BLE section)

https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/mitappinventortest/2cd6Uz__xA0/cPQSiZpcDAAJ

ABG

[Ghica]

@ABG: Thank you!
Cheers, Ghica