Problem is, unless you have POE on the Ethernet switch port, how is the device supposed to get power? USB would be easier that way because it provides power. There are lots of solutions to do what you want, but typically to monitor a handful of things and need a power supply and not as small or cheap as you probably want. For example, one tower we lease at has a device called a Web600 for alarms.
From: Chuck McCown via Af Sent: Monday, December 15, 2014 10:57 AM To: [email protected] Subject: Re: [AFMUG] cheap and dirty telemetry One. For example, if I had a small device, about the same size as a jump drive, plugged into an unused ethernet port. It could send a trap or be pollable when a condition changed. Such as a door opening or the power going out. I have done the relay on the ethernet port before. That is OK if you actually go take a look at the switch to see if it is up or down. Some managed switches can even send a trap. But I want something more generic with a TCP/IP stack in it. From: Ken Hohhof via Af Sent: Monday, December 15, 2014 9:51 AM To: [email protected] Subject: Re: [AFMUG] cheap and dirty telemetry How many things do you want to monitor per site, and what equipment do you already have there? I misunderstood that you had several things to monitor per site. From: Chuck McCown via Af Sent: Monday, December 15, 2014 10:34 AM To: [email protected] Subject: Re: [AFMUG] cheap and dirty telemetry Yeah, too big. Physically. Looking for a single port device, hopefully the same size as a jump drive. From: Ken Hohhof via Af Sent: Monday, December 15, 2014 9:32 AM To: [email protected] Subject: Re: [AFMUG] cheap and dirty telemetry http://store.packetflux.com/sitemonitor-6-channel-switch-closure-input/ From: Chuck McCown via Af Sent: Monday, December 15, 2014 10:20 AM To: [email protected] Subject: [AFMUG] cheap and dirty telemetry Lots of folks have connected a relay to an ethernet port to loop it back. When the relay is open, the connection goes away. I am looking for a way to do some centralized polling of ports like that. I don’t want to have to build some kind of small ardueno board and burn an IP for each one. But I can’t think of a way around using an IP unless the device, such as a managed switch can do an snmp trap for each port. Maybe it will become a product if it doesn’t exist. Telemetry on a stick. Two terminals for a contact closure. POE powering. Pollable and trap sending. Hopefully something like this already exists?
