MQTT ISSUE: Broker closing connection as i send connect packet

Its my first post here. Correct me if im wrong

I'm using free scale controller with G620 module for connecting to server. I started to implement MQTT client.

The communication with G620 GPRS module through UART. Through AT commands i connected to the MQTTbroker. As soon as i sent the connect packet, broker closing the connection. Need help or suggestion.

The connect packet is: { 0x10,0x12,0x00,0x04,M,Q,T,T,0x04,0x00,0x3C,0x00,0x00,0x06,Z,1,2,1,2,3 }