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