BlinkenIsdnProtocolEnglish: Difference between revisions

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The UDP port should be configurable at server and client side. The standard port is UDP 4242.
The UDP port should be configurable at server and client side. The standard port is UDP 4242.
[[Category: Protocols]]

Latest revision as of 07:32, 2 October 2007

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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.