nrf52840 ble disconnection issue

[EVOV Solutions]

Hi,

I have a medical device where my mother board has a NRF52840 chip which communicates with a Android Tablet through blue-tooth. We find it gets connected with few tablets & not with others. Following problems we see - 1) Getting connected through serial terminal manually & thereafter remains connected, 2) In other cases it connects and disconnects after say 20seconds

Can you suggest some solution for this?

Also, as my device runs on continuous main power, I want to run NR52840 on Class blue tooth...Is it possible to run it on classic blue tooth to maintain connectivity?

[Simonr]

Hi

Are there specific tablet models you're not able to connect to or maybe the device is only able to connect to X amount of tablets before not being able to connect to more? It could be that some of the tablet doesn't support the connection parameters your nRF52840 board provides, or that you reach the maximum number of links is reached in the nRF52840 is reached (this is set in the config fie as the NRF_SDH_BLE_TOTAL_LINK_COUNT and  NRF_SDH_BLE_PERIPHERAL_LINK_COUNT defines. To find out why devices are disconnected, we need to see a disconnect reason of some kind. Do you have logging enabled on the nRF side showing some kind of return or error code when the disconnects occur?

As for your classic Bluetooth question. No, the nRF5x series only supports Bluetooth Low Energy, and are not compatible with Bluetooth Classic devices.

Best regards,

Simon