From BlinkenArea Wiki
Jump to: navigation, search
Zur deutschsprachigen Version dieser Seite

back to summary

The Blinkenisdn protocol was used in early days to transmit the current state of two ISDN lines over a network.

UDP packets of 2 bytes are sent periodically (e.g. every second) and additionally on every change. Each byte represents the current state of a ISDN line.

The format of the UDP packets simply is:

| line 1 state | line 2 state |
| 0xFF         | 0x00         |
  • line X state: a byte indicating the current state of the ISDN line X
    • 0x00: on hook
    • 0xFF: off hook, no key pressed
    • '0', ..., '9', '*', '#': the key currently pressed

The UDP port should be configurable at server and client side. The standard port is UDP 4242.