qualcomm ESN QCN Method write!! - GSM-Forum

doctorsu · 05-20-2018, 02:52

hi

when qcn method write ESN it write it like that

4b 0b 24 00 5d 02 00 00 0e 00 00 00 04 00 48 3a 97 80 4c 7d 5e 7e

4b 0b 24 00 5d 02 00 00 0e 00 00 00 04 00 <-- cmd
48 3a 97 80 <-- ESN
4c 7d <-- crc
5E <-- ??????????
7E <-- complete byte

my question is whte is 5E how to calculate it ?

thanks

JayDi · 05-20-2018, 06:01

Frame_send :
7d => 7d 5d
7e => 7d 5e

frame_read :
7d 5d => 7d
7d 5e => 7e

crc :=> 4c 7e => 4c 7d 5e

7D and 7E reserved bytes. Because this you should convert them. Except last 7E - it mean frame end.

nessyb · 05-29-2018, 20:19

Quote:

Originally Posted by JayDi

Frame_send :
7d => 7d 5d
7e => 7d 5e

frame_read :
7d 5d => 7d
7d 5e => 7e

crc :=> 4c 7e => 4c 7d 5e

7D and 7E reserved bytes. Because this you should convert them. Except last 7E - it mean frame end.

Woow.. How to learn this type of programming help me sir with a hint

05-20-2018, 02:52	#1 (permalink)
doctorsu Insane Poster Join Date: Jan 2017 Posts: 95 Member: 2674769 Status: Offline Thanks Meter: 17	qualcomm ESN QCN Method write!! hi when qcn method write ESN it write it like that 4b 0b 24 00 5d 02 00 00 0e 00 00 00 04 00 48 3a 97 80 4c 7d 5e 7e 4b 0b 24 00 5d 02 00 00 0e 00 00 00 04 00 <-- cmd 48 3a 97 80 <-- ESN 4c 7d <-- crc 5E <-- ?????????? 7E <-- complete byte my question is whte is 5E how to calculate it ? thanks

05-20-2018, 06:01	#2 (permalink)
JayDi No Life Poster Join Date: Mar 2007 Location: Where you live Posts: 18,542 Member: 462970 Status: Offline Thanks Meter: 20,352	Frame_send : 7d => 7d 5d 7e => 7d 5e frame_read : 7d 5d => 7d 7d 5e => 7e crc :=> 4c 7e => 4c 7d 5e 7D and 7E reserved bytes. Because this you should convert them. Except last 7E - it mean frame end.