I've been using some ESP32 chips. I program them from Arduino IDE and I can use the BLE interface to send/receive data. At some point the BLE stopped working on some of the devices and they all seem to have a similar issue, which is: I can still see the devices sending beacons and advertising themselves, I can pair, connect, get all the services and characteristics, but I can't receive/transmit actual data any more. I tried to reprogram the chips but it didn't work out.
Anyone had a similar issue or can suggest resources I can look at?