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?

[EVOV Solutions]

Hi,

We connect only one tablet with one device. It gets connected with SAMSUNG tablet however with others we observe - a) Gets connected through serial terminal on manual intervention, b) It gets connected & then disconnects after ~20seconds., c) We observed the disconnection is with tablets having processor speed less than 2gHz., d) We see connection last from App side

Is it a hardware or firmware issue?, What can be the root cause. What is required to ensure connections last. Whether we need to do change in BLE settings?, If yes, what is the way to do to accommodate the string length.