So right now, I have a simple python app that queries servers over SNMP and displays their load averages on the sign. And the text can flash if a load average seems high, and stuff like that. I’ll do more later, I just hacked that together yesterday to get something working.
If you try this, you may notice that the sign’s protocol documentation kind of sucks. Oh, also, its Sigma software only uses that protocol as part of the format of its text files. It has another, more horrible protocol, in which lots of things are framed as file transfers. The files being transfered are also in various ugly formats.
Maybe I’ll post some code later, because this would get super-boring if I started throwing out hex codes and what endian integers to use and how it calculates checksums.
I will just say that I’m kind of wishing I’d held out for a better-known brand of sign with a better-documented protocol.
hacking the signSeptember 5, 2008 8:11am (7 years, 5 months and 1 week ago)