Hi ...
I am trying to OTA in NRF using DFU protocol.but here my master is not a Android application.I need to update a firmware using ESP32 gatt profile.As per DFU protocol,we are able to communicate to NRF and getting response for some few steps.(Before sending Init packet).we load the zip file of firmware in esp 32 and i tried to send the firmware file to data point in DFU,but we cant get any response from NRF. so if you have any sample of BLE via OTA please send the reference of that.