{"id":267,"date":"2014-05-14T22:16:41","date_gmt":"2014-05-14T21:16:41","guid":{"rendered":"http:\/\/www.anginf.de\/?p=267"},"modified":"2015-12-16T16:05:28","modified_gmt":"2015-12-16T15:05:28","slug":"monitor-raspberry-pi-temperature-from-an-external-server","status":"publish","type":"post","link":"https:\/\/www.anginf.de\/?p=267","title":{"rendered":"Monitor Raspberry Pi temperature from an external server"},"content":{"rendered":"

I’m using a raspberry pi with XBMC as a mediaplayer. As I didn’t want to have a lot of trouble maintaining it, I decided to try OpenELEC<\/a>. It works fine, but it’s really limited to only the media-related parts.<\/p>\n

I wanted to know how much the temperature changes when using my raspberry pi and I already had a working cacti-server in my LAN. But what would be the best way to read the temperature from the pi without pushing too many binaries onto the system?<\/p>\n

The answer is „socat“ – and of course, the binary is NOT part of the OpenELEC-distribution. But I was able to compile the socat as a static binary on another raspberry pi, which was runnning raspbian<\/a>.<\/p>\n

\r\n.\/configure LDFLAGS=\"-static\"\r\nmake\r\n<\/pre>\n
Copy the resulting binary socat<\/code> to the OpenELEC-raspberry. If you can’t create the binary yourself, you can download it from here:<\/p>\n
socat 1.7.2.4 statically linked<\/a><\/p>\n
socat: ELF 32-bit LSB  executable, ARM, EABI5 version 1 (SYSV), statically linked, for GNU\/Linux 2.6.26, BuildID[sha1]=8ca6f5b38a7836cefe0721295d946dd9f90fb98e, not stripped<\/pre>\n
Put the socat in a new directory called \/storage\/tempservice\/<\/code>.<\/p>\n
Add the following two files in the same directory \/storage\/tempservice\/<\/code>:<\/p>\n
socat-service.sh<\/code><\/p>\n
\r\n#!\/bin\/bash\r\n\/storage\/tempservice\/socat -T 1 -d -d tcp-l:9888,reuseaddr,fork,crlf system:\"\/storage\/tempservice\/t.sh\"\r\n<\/pre>\n
t.sh<\/code><\/p>\n
\r\n#!\/bin\/bash\r\ncat \/sys\/class\/thermal\/thermal_zone0\/temp\r\n<\/pre>\n
socat-service.sh<\/code> will later start the service, while t.sh<\/code> reads the temperature itself.<\/p>\n
To make sure that the service is started on startup, we introduce a new system service in system.d<\/code>: Change to the directory \/storage\/.config\/system.d<\/code> and add the following file:<\/p>\n
socat.service<\/code><\/p>\n
\r\n[Unit]\r\nDescription=SocatTempServer\r\n\r\n[Service]\r\nType=simple\r\nExecStart=\/storage\/tempservice\/socat-service.sh\r\n\r\n[Install]\r\nWantedBy=multi-user.target\r\n<\/pre>\n
And enable the service:<\/p>\n
\r\nsystemctl enable socat.service\r\n<\/pre>\n
Reboot and test from the other system in the LAN whether we can read the temperature:<\/p>\n
\r\nnc PI-IP 9888 | tr -d '\\r'\r\n<\/pre>\n
Now all you have to do is include the result in a cacti script and show the result. \ud83d\ude42<\/p>\n
Here’s what it may look like:
\n
\"An<\/a>
An example for a cacti picture measuring raspberry pi temperatures<\/figcaption><\/figure><\/p>\n","protected":false},"excerpt":{"rendered":"
I’m using a raspberry pi with XBMC as a mediaplayer. As I didn’t want to have a lot of trouble maintaining it, I decided to try OpenELEC. It works fine, but it’s really limited to only the media-related parts. I wanted to know how much the temperature changes when using my raspberry pi and I … Monitor Raspberry Pi temperature from an external server<\/span> weiterlesen →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,3,2],"tags":[],"class_list":["post-267","post","type-post","status-publish","format-standard","hentry","category-allgemein","category-cacti","category-raspberry-pi"],"_links":{"self":[{"href":"https:\/\/www.anginf.de\/index.php?rest_route=\/wp\/v2\/posts\/267","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.anginf.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.anginf.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.anginf.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.anginf.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=267"}],"version-history":[{"count":12,"href":"https:\/\/www.anginf.de\/index.php?rest_route=\/wp\/v2\/posts\/267\/revisions"}],"predecessor-version":[{"id":417,"href":"https:\/\/www.anginf.de\/index.php?rest_route=\/wp\/v2\/posts\/267\/revisions\/417"}],"wp:attachment":[{"href":"https:\/\/www.anginf.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=267"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.anginf.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=267"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.anginf.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=267"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}