Datafield to read & control Forumslader (Bicycle Dynamo Power Bank)

The first thing I'd do is insure that a garmin device can see this with BLE.  The CIQ implementation is a bit minimal.  Try this app: https://apps.garmin.com/en-US/apps/9bcc8b66-8385-4afb-b93e-f69e01422284

There are other things to look at, such as the max size of a read is 20 bytes or so.

I checked it, and i can see the device, but cannot connect to it. The name of the BLE device is not display, although is has one ("FL_BLE").

I am looking for a simple code example, to start programming and debugging. It should connect to the device with the given name "FL_BLE", read a value from the payload, and display it in a IQ datafield. Can you point me to some example, e.g. on github?

The SDK has two samples that use BLE.  The NordicThingy52 (a device app) and the NordicThingy52CoinCollector (a data field)  With BLEScan, do you see a UUID?  For most things I don't see a name, but with a UUID you can look for that in a scan and pair when it's found.

I see the device (can identify it by rssi value) and 1 UUID. But connect fails.

With nRF connect App (Android) i see the devices's complete local name ("FL_BLE") and the same UUID. Connect works.

It's not uncommon that with CIQ you don't see the name.  What you want to fucus on its what you see as a UUID in CIQ and look for that when scanning.

Do you have the BLE spec for your device?

There is no published spec, thus i peeked into connection by nRF connect Android App.
After i connect to the device with nRF connect, i see the GATT handshake, and after this the payload of the device.

Not sure, i interprete it correctly, for me it seems the device offers only one service UUID (0xffe0) and one characteristic (0xef38) which allows to enable a notification. These notifications include the raw payload of the device, which my CIQ app shall decode (beginning with "$FL5...") and process.

Meanwhile i tried to write my first CIQ app. Can't run it in the simulator, because for BLE operation i need to get the nRF dongle before. Thus, i built a .PRG file with visual studio code an copyied it to path /garmin/Apps on my Edge1030, expecting to see the app in the IQ menu. But it's not there :-( What's going wrong here, why does the side load not work?

V 13:38:32.515 Connecting to 78:A5:04:xx:yy:zz...
D 13:38:32.515 gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D 13:38:32.763 [Server callback] Connection state changed with status: 0 and new state: CONNECTED (2)
I 13:38:32.763 [Server] Device with address 78:A5:04:xx:yy:zz connected
D 13:38:32.767 [Callback] Connection state changed with status: 0 and new state: CONNECTED (2)
I 13:38:32.767 Connected to 78:A5:04:xx:yy:zz
V 13:38:32.780 Discovering services...
D 13:38:32.780 gatt.discoverServices()
D 13:38:32.794 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
I 13:38:33.212 Connection parameters updated (interval: 7.5ms, latency: 0, timeout: 5000ms)
D 13:38:33.383 [Callback] Services discovered with status: 0
I 13:38:33.383 Services discovered
V 13:38:33.390 Generic Access (0x1800)
- Device Name [R] (0x2A00)
- Appearance [R] (0x2A01)
- Peripheral Privacy Flag [R W] (0x2A02)
- Reconnection Address [R W] (0x2A03)
- Peripheral Preferred Connection Parameters [R] (0x2A04)
Generic Attribute (0x1801)
- Service Changed [I] (0x2A05)
Client Characteristic Configuration (0x2902)
Unknown Service (0000ffe0-0000-1000-8000-00805f9b34fb)
- Unknown Characteristic [N R WNR] (0000ef38-0000-1000-8000-00805f9b34fb)
Client Characteristic Configuration (0x2902)
Characteristic User Description (0x2901)
D 13:38:33.390 gatt.setCharacteristicNotification(00002a05-0000-1000-8000-00805f9b34fb, true)
D 13:38:33.392 gatt.setCharacteristicNotification(0000ef38-0000-1000-8000-00805f9b34fb, true)
I 13:38:33.459 Connection parameters updated (interval: 30.0ms, latency: 0, timeout: 6000ms)
I 13:38:33.857 Notification received from 0000ef38-0000-1000-8000-00805f9b34fb, value: (0x) 24-46-4C-35-2C-30-30-43-30-30-30-2C-30-2C-30-2C-34-30-35-37, "$FL5,00C000,0,0,4057"
A 13:38:33.857 "(0x) 24-46-4C-35-2C-30-30-43-30-30-30-2C-30-2C-30-2C-34-30-35-37, "$FL5,00C000,0,0,4057"" received

What type of app?  If it's a data field, once you sideload, you need to add the data field to a data screen in the activity.  Widgets and device apps are also accessed in different ways.  This IQ option is for device apps, and widgets are accesses by way of a swipe from the top on a 1030 if I recall.

Oh, yes, I programmed a data field, not an App. Thanks for the hint. The data field worked.
But not to the BLE problem: I can't find the UUID of the device ("Unknown Service" 0000ffe0-0000-1000-8000-00805f9b34fb) in the scan results of the garmin. Does the garmin scan only known services? How can i connect to the device's unknown service UUID?

I installed the NordicThingy52 CIQ app and changed device to edge1030. The app ist listed on the device in the IQ menu, and it starts. But after i press "start scanning" is does not show any scan results, display stucks to "Device: 0/0" - i guess i do something wrong with bluetooth...

Did you change the UUIS in the profile manager in the Nordic sample?  It's looking for the specific UUID of the Thingy52 when scanning.