Write to FTMS Device

[serramat]

Hi,
I am using your library to read the data from the BLE sensors and I was able to receive the information correctly.
Now I would also need to write data on some devices (such as assigning the friction to a roller). I am using the WritePackage but I can never write! I also tried your example but without any success.

To be precise I'm trying to write on the 00002ad9-0000-1000-8000-00805f9b34fb characteristics of the 00001826-0000-1000-8000-00805f9b34fb service

Thank you so much.
Matteo.

[adabru]

Hi @serramat , you could try the things mentioned in #20 (comment) .

[ShuohengZhang]

Hi @serramat , you could try the things mentioned in #20 (comment) .

Hi adabru, thanks for your great work on this BLE.dll! By the way I have the similar problem as @serramat had. The whole DLL worked very well since I use it, and since October the write value is down. There's no errors but only the FTMS indoorbike doesn't react to the value it received. Specifically I want to change 2 Bytes ('0x11, 0x00, 0x00, Byte1, Byte2, 0x00, 0x00'). I tried changing GattWriteOption::WriteWithoutResponse to GattWriteOption::WriteWithResponse at https://github.com/adabru/BleWinrtDll/blob/main/BleWinrtDll/BleWinrtDll.cpp#L536 . , this doesn't work in my case, but I tried with nRF Connect on iOS system. Where I write '110000DC050000' would make the FTMS indoorbike change its inclination grade to '15' correctly. I even wrote a UWP application to test the function, and surprisingly it works. But as I use the UWP specific API, I cannot make it into a dll and import to Unity. And I'm stucking to this problem for a month but I still cannot figure out where's the problem. Could u please help me out ?

[adabru]

Hi @ShuohengZhang ,
it's good that your UWP application works. The dll in this repository is a c++ winrt wrapper for UWP code so the step from your UWP app to the dll should be small.

You can compare the UWP function calls from https://github.com/adabru/BleWinrtDll/blob/main/BleWinrtDll/BleWinrtDll.cpp with your UWP app. If your UWP app uses another API-call, you can change that in BleWinrtDll.cpp. Or you can change the API-call in your UWP app to the same as in BleWinrtDll.cpp.

As reference for converting UWP code to c++ winrt and vice versa, you can use
https://github.com/microsoft/Windows-universal-samples/blob/main/Samples/BluetoothLE/cppwinrt/Scenario2_Client.cpp
and
https://github.com/microsoft/Windows-universal-samples/blob/main/Samples/BluetoothLE/cs/Scenario2_Client.xaml.cs
Those are functionally the same.

[ShuohengZhang]

Hi @adabru,
Thanks for your reply!! And yeah, I was a bit afraid to write a C++ DLL by myself because I don't really understand the C++ codes that well. However, I tried it with your suggestions today and looked into your codes and the samples I made (Dll_BLE.cpp). When I import this DLL into the Unity project, there is a DllNotFoundException when I already put it in the same folder as your BLEWinrtDll (I assume when this DLL can be used, so should mine). I would so appreciate hearing your suggestions!!

Best regards!

[adabru]

I'm not quite sure what the reason for the DllNotFoundException is. You can try to look at Unity's import settings for that file. You can also try to change the 32-bit or 64-bit setting in VS. And maybe try to ask ChatGPT.

Is your repository private? I can't access the link.

[ShuohengZhang]

@adabru sorry I didn’t notice that was private now u may have the access. And thanks again that you still concern about my case !