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Please do not sign, credits/modifications can be reviewed thruogh the history pages.
{{Needs review}}
==Heyu Overview==
{{Level|Medium}}
===Description===
===Description===
Heyu is a driver and control program for managing Power Line Interface Modules such as those made by X10. This program is only useful if you have such a module connected to your server. Note that while there are alpha level quality drivers for the USB versions (e.g. CM15) the drivers and links below relate to the serial port versions (such as the CM11a).
Heyu is a driver and control program for managing Power Line Interface Modules such as those made by X10. This program is only useful if you have such a module connected to your server. Note that while there are alpha level quality drivers for the USB versions (e.g. CM15) the drivers and links below relate to the serial port versions (such as the CM11a).
http://www.linuxha.com/
http://www.linuxha.com/
===Credits===
==Installation Procedures==
===Obtaining the software===
===Obtaining the software===
The software is available only in source form from:
The software is available only in source form from:
===Initial Configuration===
===Initial Configuration===
Don't forget to edit the '''/etc/heyu/x10.conf''' file to update things like your longitude and latitude and other useful settings.
Don't forget to edit the '''/etc/heyu/x10.conf''' file to update things like your longitude and latitude and other useful settings.
Note that any changes made to x10.conf need to be re-read by heyu. The simplest way is to issue the following command from the command line:
heyu restart
===Initial Launch===
===Initial Launch===
heyu monitor
heyu monitor
==Use via another application==
===Overview===
As given in the references, heyu is often used by higher level applications such as web application. In this case, it should be noted that the application's identity will be passed to heyu and thus certain resources may not be accessible to the application. For example, the serial port (e.g. ttyS5) normally has the ownership of user=root,group=uucp, and permission 0660. Normally heyu can access this because it runs as root.
If, however, you have a web application it may be running as www hence would not be able to have heyu access the serial port. Group membership or permissions can be adjusted as needed with consideration to the security implications of those changes.
===Changing permission on serial port===
In the case of the serial port, you could either modify its ownership or its permissions. In this example, we will allow others to have read/write permission specifically on the serial port of interest (e.g. ttyS5). By default udev only allows user and group with read/write and other has no access.
The serial port's permissions and ownership are recreated dynamically on reboot by '''udev'''. So we need to modify udev's rules to achieve our objective. Specifically the directory /etc/udev/permissions.d/ contains the permissions and in SME the default permissions are in /etc/udev/permissions.d/50-udev.permissions.
We will add a template to specifically override the permissions for our serial port.
mkdir -p /etc/e-smith/templates-custom/etc/udev/permissions.d/
touch /etc/e-smith/templates-custom/etc/udev/permissions.d/41-udev.heyu.permissions
Edit the new file above (41-udev.heyu.permissions) using an editor with the contents as follows:
# special exception to allow heyu running under www to access the relevant
# serial port
ttyS5:root:uucp:0666
Now expand the template and reboot to verify the changes worked
expand-template /etc/udev/permissions.d/41-udev.heyu.permissions
signal-event reboot
After reboot verify that only your serial port has been changed.
====Special notes====
Udev follows permission rules in the order in which they appear. So the serial port rule is named to preceed the default set of permissions (hence 41 at the beginning of the file).
This procedure works for CentOS 4 (SME 7) but will change in CentOS 5 (SME 8) to use rules.d instead.
==Reference Information==
===Documentation===
===Documentation===
Heyu is very well documented and includes man pages. Start with:
Heyu is very well documented and includes man pages. Start with:
http://www.linuxha.com/athome/index.html#Software
http://www.linuxha.com/athome/index.html#Software
===User experience===
Users who have implemented this how-to should add their experiences as data points of success for others. Please sign your experience using four tildes (~).
* Tested with SME Server 7.3 and X10's CM11a - Works ([[User:Christian|Christian]] 20:52, 13 October 2008 (UTC))
* Tested with SME Server 7.3 and X10's CM11a - Works
:: - Serial port is via a Lava Link 2 port serial card
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[[Category:Howto]]
[[Category:Howto]]