The device packets may include {TAIL ~ a header}, a control portion and {HEAD ~ a data portion} 
The device packets may include { TAIL ~ a header } , a control portion and { HEAD ~ a data portion }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD