1 Listenning and sending

There are two differents implémentation under RED-HAT and DEBIAN families.

using FEDORA:

$ nc -u -l 1235
                                    $ nc -u 127.0.0.1 1235 
                                    coucou
coucou

using DEBIAN:

$ nc -u -l -p 1235
                                    $ nc -u 127.0.0.1 1235 
                                    coucou
coucou

2 Sending and receiving bytes

$ nc -u -l 1235 < hexaQuery
                                    $ nc -u 127.0.0.1 1235 > hexaResponse

2.1 Building an hexa file

We first have to build an empty file:
```
$ dd if=/dev/zero of=/hexaQuery bs=4 count=4
```
We use data block of 32 bits.
Next we have to edit it:
```
$ hexedit hexaQuery 
^Q
(or)
$ hexcurse hexaQuery
^S ^Q
```
As Java is using big-endian and PC little-endian, we have to translate each 4 bytes as : abcd => dcba.
IE: 67 45 23 01 should be translate as 01 23 45 67.

2.2 Reading an hexa file

$ hexdump hexaResponse

Warning: on PC, hexdump and tcpdump permute each block of 2 bytes (I don't know why). IE: 23 01 67 45 should be translate as 01 23 45 67.

3 Testing the GEDEK

Please consider this code: there is only 5 register working on the 256 allowed ?!

$ ./go
] Monitoring UDP Port 0x04d3 for registers
reg 0x00: OK
reg 0x01: OK
reg 0x02: OK
reg 0x42: OK
reg 0xff: OK
] Done !

Capture the NECTAR outputs:
```
$ nc -u -l 1234 > outData
```
(todo) Sending NECTAR order:
```
$ nc -u 192.168.1.18 1234 < inOrder
```
Updating GEDEK virtuals registers:
Build the inRegister query file with these bytes:
00 FF 08 01 78 56 34 12
```
$ nc -u 1235 < putRegister
```

Reading GEDEK virtuals registers:
Build the inRegister query file with these bytes:
00 FF 04 01

                                 $ nc -u -l 1235 > outData
$ nc -u -l 1235 < getRegister
                                 $ hexdump outData
                                  0000 0104 3412 7856

Home

This document is also available in PDF and PostScript format.

2016-02-15

Contents

1 Listenning and sending

2 Sending and receiving bytes

2.1 Building an hexa file

2.2 Reading an hexa file

3 Testing the GEDEK