Bluetooth LE - Search only for devices with given names

[Uwe]

Hi,

I already use Bluetooth LE and all works fine, but if I scan for BT devices I got a very big list of devices.

I only want to have devices in the devicelist with specific names. Is that possible?

Thanks,

Uwe

[BodyMindPower]

If you want to declare that your app is available to BLE-capable devices only, include the following in your app's manifest:

<uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>

https://developer.android.com/guide/topics/connectivity/bluetooth-le

Anke

see also here: https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/mitappinventortest/RCV2LgCg62k/9T8WmS_AAQAJ

[TimAI2]

If you know the names you want to see you can filter the list before display using list and text manipulation blocks

[Uwe]

Thanks Anke, but I only want to have the names I know in that list, not all BLE-devices.

Uwe

[Uwe]

Yes Tim thats exactly what I want to it to do.

Do you have an idea for me on how to do?

Uwe

[TimAI2]

You make a list of all your known devices

You get the known addresses back, as a list, from the BLE block

Remove any items in the second list that do not match items in the first list

Use the resulting list in your blocks

Test each item in the BLE returned list to see if it is a thing in your list of devices

If it is, do nothing, if it isn't remove it from the BLE list

[Chris Ward]

Hello Uwe

Code snippet on my website:

https://www.professorcad.co.uk/appinventorsnippets#ListFilterSpecific      Filter-Down to a Specific List Required

[Uwe]

Thanks all for your help. But it did not work as expected.

I tried the following:

But I always get an error that says:

Actually I do not understand the problem, everything *looks* quite ok.

I don´t undertand the error message.

[Chris Ward]

Hi

It is because your List consists of only one item, so the inner "For Each" is not required.

[TimAI2]

A bit easier ?

[mariano millañanco]

Hola creo que te falta un paso. Proba poner una lista auxiliar quedaría algo así

[Uwe]

Hi Chris,

I removed the inner ForEach but get the same result:

Code:

My BLE Modul is called MODUL so I only want to find that one and add to the list.

[Uwe]

Hi TimAI2,

I also tried the easier solution but the result is almost the same:

[Uwe]

So I found the problem about the runtime error with the "forEach".

The problem is if I use this:

will causes the runtime errors!

If I use this for example (which is useless for me):

It works as expected.

It looks like the forEach didn´t accept the BluetoothLE1.DeviceList as a list.

Is there an chance to use it with the BluetoothLE1.DeviceList?

All others code which was posted here works fine WITHOUT the BluetoothLE1.DeviceList and with a preconfigured list with MakeList.

[SteveJG]

Perform a DoIt on the DeviceList Bluetooth Block to see what it contains.  Determine if that is a List or a JSON .

[BodyMindPower]

Anke

[BodyMindPower]

to get a list try this:

[Uwe]

Hi Anke,

thanks for your help. Finally I got this part working. I will only see my "Modul" in the list, BUT ... I cannot connect to it.

The "replace list item" must be used because if not it will lists the same "Module" with different RSSI in one list. To prevent this the "old" received Modul is replaced by the newest one.

But if I want to connect to it it doesn´t connect. I am not sure if this is because of the Index or not. I try to have the last known Index of the last entry of the "Modul" and try to connect

to it but it also doesn´t work. If I just use the ListView without any filtering it works perfect.

[BodyMindPower]

What method do you use to connect the BLE device? Show these blocks too or post the aia (upload it to Google Drive, because aia with extensions are not allowed here) .

[Uwe]

I just use the following, which works perfectly if I do not use the Filter and list all available BLE Devices in the list:

With the filter the Index is always 1 (because only 1 entry in the list)

[BodyMindPower]

The logic in the procedure would have to be adjusted. Esp. if condition <1 should be removed ...

try something like that:

and try to connect with:

Anke

[Uwe]

Hi Anke,

the list will show only 1 MODUL as expected, that´s great.

To connect with (changed) MacAdresses but with the same name I integrate the following code:

After that I just connect to the MODUL with

Now everything works the way I want it to work :-)

Thanks to all and specially to Anke for helping me.

Uwe