Cannot scan for devices over BLE using Garmin simulator + nRF52840 DK and the sample NordicThingy52 app

Hello, I am using an nrf52840 DK and trying to interface with the Garmin simulator to scan for devices over BLE. I am using the sample NordicThingy52 app and onScanResults() seems to never get triggered (added a print statement but never printed). I followed the instructions here: https://forums.garmin.com/developer/connect-iq/w/wiki/19/getting-started-with-connect-iq-ble-development and do not get an error when setting the COM port that the dev kit is connected to in BLE settings. I am using mac OS 14.

Would anyone have any suggestions? Thanks in advance!

7929520 over 1 year ago in reply to jim_m_58

Sounds great, thanks! Not sure what is wrong then. It just keeps going back and forth between scanning and onConnectedChange. Would there be an intermediate step that is not allowing me to keep the connection/receive messages?

jim_m_58 over 1 year ago in reply to 7929520

It could be your sensor requires a more advanced BLE implementation than Garmin provides. There are changes in the works, as with the 7.0.x bonding looks like it has been added, though I've not tried it.

"API 5.0.0 devices can also pair with BLE devices using Just Works pairing. The system will remember the bonded devices and allow you to reconnect with devices you have previously bonded with."

7929520 over 1 year ago in reply to jim_m_58

Thanks, trying that now. Also, through the nRF connect app I see that the UUID of the configuration characteristic that enables/disables notifying state of the characteristic is 2902. How would I implement that?

jim_m_58 over 1 year ago in reply to 7929520

//Using 16 bit UUIDs
//Ref. the Bluetooth Core Specification 5.2, Vol 3, Part B, section 2.5.1 UUID:

//The first UUID in this pre-allocated range is known as the
//Bluetooth Base UUID and has the value 00000000-0000-1000-8000-00805F9B34FB

//(...)

//The full 128-bit value of a 16-bit or 32-bit UUID may be computed by a simple
//arithmetic operation.

//128_bit_value = 16_bit_value * 2^96 + Bluetooth_Base_UUID


//128_bit_value = 32_bit_value * 2^96 + Bluetooth_Base_UUID"

//What it means in practice, is that you take a "base UUID" of 0000xxxx-0000-1000-8000-00805F9B34FB, 
//and replace the x-es with the 16 bit UUID.

So for example, with the HRM-PRO I use:

var HR_SERVICE = Ble.longToUuid(0x0000180D00001000L, 0x800000805F9B34FBL);

var HR_CHAR = Ble.longToUuid(0x00002a3700001000L, 0x800000805F9B34FBL);

7929520 over 1 year ago in reply to jim_m_58

Thanks a lot, hasn't worked yet but will keep trying. Also to trigger onCharacteristicWrite() how do you call the requestWrite() command?

7929520 over 1 year ago in reply to 7929520

Haven't figured out what the procedure is to write to a characteristic

jim_m_58 over 1 year ago in reply to 7929520

Look ate the code I posted that uses a raspberry pi CommQueue.mc.

7929520 over 1 year ago in reply to jim_m_58

Thanks a lot for the help, I am able to read and write to an Arduino. However, I am currently trying to read data from the STM's Sensortile box pro. I am able to connect to the device but I cannot read and it disconnects. Would it be possible to get your help? The code used for the sensor tile box pro is open source and it is possible/I have been trying to change the BLE driver/implementation but not sure how to do it correctly.

These are the serial print outs when trying to connect with the Garmin simulator:

>>>>>>CONNECTED d7:1:c0:c3:c3:93

hci_le_advertising_set_terminated_event

hci_le_channel_selection_algorithm_event

aci_gatt_clt_proc_complete_event Ok

<<<<<<DISCONNECTED

aci_gap_set_advertising_configuration

aci_gap_set_advertising_data_nwk

aci_gap_set_advertising_enable

and this is what I get for a successful connection with the phone (nRF connect app):

>>>>>>CONNECTED 6d:5d:c0:7a:2e:ce

hci_le_advertising_set_terminated_event

hci_le_channel_selection_algorithm_event

Error: ACI GATT Exchange Config Failed (0x85)

hci_le_phy_update_complete_event Status=0x0

TX_PHY=0x2

RX_PHY=0x2

aci_gatt_clt_proc_complete_event Ok

Notification on Service Change Characteristic

UUID Rescan Forced

aci_gatt_srv_confirmation_event

Start Iner@10Hz

7929520 over 1 year ago in reply to 7929520

https://github.com/STMicroelectronics/fp-sns-stbox1

The BLEPnP code for example.

7929520 over 1 year ago in reply to 7929520

I cannot trigger onCharacterisitcChanged even though I call cccd.requestWrite([0x01,0x00]b); The characteristic is recognized (not null)