Homekit BLE will disconnect if no data is exchanged for a period. But if I would like to perform a firmware update with my owm smart phone app, what is the appropirate operation to avoid disconnection before transmitting the image file? Perhaps keep sending some packet from iphone?

When TCKM002 is tested in the Key Management Test case, the iPhone will send a reset command to the accessory after selecting "Set+Verify key Rotations" in the FMCA app, resulting in the BLE disconnection. Sometimes iPhone will not send a Connection Indication Packet after disconnection. FMCA APP displays an error like attachment. May I ask why?