Dear Nihal0512,
The packet you are showing (03 03 F7 F4) is not a proprietary packet, but a standard Qi packet.
In this case, it is a Control Error Packet sent by the receiver to regulate the level of transmitted power.
The Control Error Value (F4) is a two’s complement signed integer value that is a relative measure for the deviation
between the actual and target operating points of the Power Receiver. It is usually updated every 250ms.
In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.
