Simple Bluetooth server

[Martin_Wood]

I'm trying to set up a simple bluetooth server so I can ulitmately connect my sports watch to it, however I can't seem to see the server in any BLE scanning apps, making wonder whether this component is only for internal APP inventor bluetooth client <-> server applications, having re-read the docs :

Use the BluetoothServer component to turn your device into a server that receive connections from other apps that use the BluetoothClient component.

The blocks I'm using are here and the status variables are polled every second to give realtime feedback:

The app looks like this - nothing fancy at all just creating an isolated unit:

If someone can let me know if I have to resort to custom code to achieve then I'll just go down that route instead of using these components.

Thanks for any help

[Salman_Dev]

Bluetooth Client + Server + MIT App Inventor 2

[Martin_Wood]

Thanks for the tutorial, however I can't see my BLE_A device in any BLE scanning apps. Is it only visible to MIT App inventor BLE clients?

[Salman_Dev]

Yes, if you want to connect your device with another device you have to use a bluetooth client, and the device you want to connect have to use the bluetooth server to accept the connection.

and I suggest you to try 2 projects below, so you can see how it works

BlueT_Server.aia (23.1 KB)
BlueT_Client.aia (17.4 KB)

Note: try two projects on different devices

[ABG]

@Martin_Wood

can't seem to see the server in any BLE scanning apps

BLE is different from plain BlueTooth.
Start here ...

FAQ Section: BlueTooth/BLE and Arduino Starter

BLE Connection Starter Guide - @ewpatton Arduino 101 Intro - MIT BLE LED Controller | Feather 32u4 Bluefruit LE + MIT App Inventor - gerrikoio

FAQ Section: BlueTooth/BLE

BLE Releases BluetoothLE extension 20240822 Java 11 UUID bugfix - @ewpatton BluetoothLE extension 20240322-beta bugfix - ewpatton BluetoothLE extension 20230728 released - ewpatton BluetoothLE extension 20201223 released - ewpatton BluetoothLE extension 20200828 released - ewpatton BluetoothLE extension 20190701 released - EWPatton BLE Problems java.lang.RuntimeException: no such class: edu.mit.appinventor.ble.BluetoothLE Build Error - Anke How to clean out residual BLE extension part…

[Martin_Wood]

Thanks for posting those articles - I've updated the extension, now to learn all the new methods

So if I want to create a fake cycling power meter - how easy is that? I can connect to heart rate monitors and power meters no problem ( using standard blue tooth component within Connectivity ) however I'm not sure it's possible within an Android app to do something like this:

I'm calling the device BLE_A and giving the service UUID of Cycling Power Measurement - the hope is that my running watch will see it as a device, but suspect there's a lot more that I need to do or it's not possible ( so will have to build it on Arduino ).

Thanks everyone for their help,

Martin