Sending a hex string to a remote via netcat
netcat
Solution
You can do it with command: `echo -n -e "\x02\x45\x31\x38\x03\x34\x43\x0d\x0a" | nc [-u] <-ip-addr-> <-port-no->`
- The `-n` supresses outputting the trailing newline.
- The `-e` enables the interpretation of backslash escapes -> allowing us to send hex codes.
- `'x'` before each character specifies that the byte is in hexadecimal form.
- `-u` switch to UDP traffic (optional)
Problem
I've got some binary commands (which I'm representing as hex) that I need to send to a remote device (it's an embedded data collection device) and observe the reply. It's easy to connect to it with netcat ``` nc -v 192.168.200.34 19000 ``` and it sits there happy as a clam. The hex string I need to type in terminal and then send is something like: 02:45:31:38:03:34:43:0d:0a Where 02 is STX, 03 is ETX and so on. But when I type this into my netcat window (with or without spaces , with or without the colons) netcat transmits it as ascii. All the literature is happy to tell me how to capture a hexdump from the remote device, but not how to transmit binary/hex data to the remote device. Is this an easy thing to do, or am I missing something?