pc-ble-driver connection problem

[Jong yoon lee]

Hello, I am developing with pc-ble-driver using python. I noticed that the Bluetooth connection becomes disconnected when I alt tab out of the gui I made. Is there a solution for this and why is this happening. When this happens nothing appears on the command prompt like ble_disconnect message. When I try to reuse the bluetooth feature like to advertise I get Error code: 12289 from the driver.

I think the the nrf52 board I am using as a central device is not working correctly? Is the softdevice provided for these not enough in order to make a project? and if not how do I need to modify the code.

I am using nrf52 chip and I tested for both 115K and 1M softdevice. I using a pyqt as my gui api.

Thank you ahead,

[Jong yoon lee]

Today I will do the same test with the sampling rate high( maybe 100 HZ) and let you know of the result. Thank you update: I did the test for 100Hz and I did not have any connection issue. I will test with the 1M hex for the next test. I still get the random problem stated above

[Jørgen Holmefjord]

Which version of pc-ble-driver-py do you use? Error code 0x04 means NRF_ERROR_NO_MEM, so I think the problem with more than 5 connections is due to not enough RAM available for the softdevice in the precompiled connectivity hex-file. I compiled the connectivity firmware for PCA10040 with increased RAM space for softdevice and tested with pc-ble-driver-py v0.8.0 (can be installed using pip install pc-ble-driver-py==0.8.0) and this works with CONNECTIONS set to 8.

[Jong yoon lee]

Thank you so much for your support.What is the communication speed of the firmware you posted. Is it 115K?

[Jørgen Holmefjord]

Yes, it is 115K.

[Jong yoon lee]

Hello, How do I compile one for 1M. Is there a repository I can download and change these parameters?