Difference in characteristics display between nRF Connect App on PC and App on MOBILE

[Stefan Wyss]

Hi,

I am developing a sensor application with the nRF52832 on a custom board.

Therefore I designed a GATT with nRF5_SDK_14.0.0 softdevice which exposes 3 custom characteristics with their associated Characteristic User Descriptors. This all looks OK when connecting with the nRF Connect App on the PC, shown in the following picture:

But when I try to display these characteristics on my MOBILE nRF Connect APP, I get the following "strange" display (I added red markers on the screen-shot):

[1] Why does the APP show "Unknown Characteristic" where it should display my Characteristic User Descriptor?
[2] Why ist there such a strange (long) value shown on the second characteristic? This characteristic should read only 4 bytes (see screenshot of nRF Connect on PC).
[3] Same here?

I already reinstalled the nRF Connect APP on my MOBILE, but still the same... How can I get the same data on my PC APP and on my MOBILE APP with nRF Connect?

Thanks for your support.

With kind regards, Stefan

[Stefan Wyss]

I don't know how to upload to devzone, so here is an external link for downloading my project:  https://drive.google.com/file/d/1_p5jeaIHz33PLexP4xDLm0mKe_gONNPr/view?usp=sharing

Please note that  this is an IAR project and must follow a special folder structure for the relative SDK path:

.\nrf52_3100-1_fw
.\nrf5_sdk\nRF5_SDK_14.2.0_17b948a

Although it's for a custom board, it should run fine on the nRF52 DK (with internal RC LFCLK).

[Jørgen Holmefjord]

I'm not able to reproduce this on my phone (Samsung Galaxy S7). Which phone are you using, and what version of nRF Connect are you running?

[Stefan Wyss]

iPhone 7, nRF Connect 1.8.8 APP

[Jørgen Holmefjord]

My colleague tested with iPhone 7 and same version of nRF Connect, and we are not able to reproduce the issue. Can you try this hex-file that I compiled (does not include softdevice), to check if there are any issues in your project/SDK setup? proof_of_concept_pca10040_s132.hex

If this also does not work, I will forward the issue to our app developers.

[Stefan Wyss]

Ok, I tested your proof_of_concept_pca10040_s132.hex on my custom board with my iPhone7. It still shows garbage as you can see in the following screenshot.

Please forwart this to the APP developers. I also think it is an iPhone 7 specific problem and I consider this case as closed.

Thank you very much for your excellent support!

Cu, Stefan