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
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.
