rcrecv-daemon

FreeBSD RC receiver daemon for the rcrecv-kmod driver.

About

The daemon is designed to interact with a rcrecv.ko kernel driver. You can get the driver from there rcrecv-kmod. I wrote them both for my aquariums. Their light and air managed by another my project relay-pi-webui. But once I think it would be good to have a remote control to turn the light on and off instead of do it with a web interfaces buttons. I never got how to use gpio interrupts from user programs and there they are, a kernel driver and a daemon.

Description

A rcrecv-daemon listens for a poll(2) or kqueue(2) event from a rcrecv.ko kernel driver which means that the driver have a code for the daemon. After the event occurs the daemon reads the code from character device /dev/rcrecv. For these codes, the daemon performs the action that was configured when the one was started. Possible actions are set, unset or toggle a pin. In my case it is the same pins which I had configured for an automatic management of lights and an air compressor, so that pins can be switched both with cron and with a remote control. If several consecutive codes is all identical, then after the first successive code the next ones are ignored if they follows too fast. The minimum interval between two identical codes is 1000ms and can be changed. This prevents the relay from switching too quickly when the remote control button is held pressed.

Installation

First of all You need a kernel driver rcrecv.ko (see above) installed. See its README.md to build, install, configure and load it.

Then You can build and install the daemon:

make
sudo make install

This commands will install a daemon itself, its service script and its man page. You need also a service config file, example of one You can find in ./rc.conf.d/. Edit it to suit Your remote control codes and copy it as rcrecv_daemon (underscore, not a hyphen) to /usr/local/etc/rc.conf.d/ or just place its code into /etc/rc.conf (old school).

You can read alse man pages of the daemon and kernel driver:

man 8 rcrecv-daemon
man 4 rcrecv

Bugs

After reloading the rcrecv.ko kernel driver when the rcrecv-daemon service is still running, the next restart of the service ends with an OS restart.

I think about it.