update new draft
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title = 'DMRHost on OpenBSD on a Raspberry-Pi 4'
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summary = ''
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date = '2023-08-20T08:24:04+02:00'
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lastmod = '2023-08-20T08:13:37+0000'
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lastmod = '2023-08-20T09:15:14+0000'
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categories = [ 'amateur-radio' ]
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tags = [ 'hotspot', 'raspberry-pi', 'openbsd' ]
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# showBreadcrumbs = true
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# showDate = false
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# showReadingTime = false
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# showWordCount = false
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# showPagination = false
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# feed_exclude = true
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# site_exclude = true
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draft = true
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+++
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## Get the files
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Download `install73.img` from <https://www.openbsd.org/arm64.html> and
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write it to a USB stick.
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## Installation of OpenBSD
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Get yourself comfortable with this nice piece of documentation: [INSTALL.arm64][0]
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[0]: https://ftp.openbsd.org/pub/OpenBSD/snapshots/arm64/INSTALL.arm64
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Connect a USB-to-TTL cable to the GPIO pins of the serial console on your Raspberry Pi
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(That means you have to remove the MMDVM hat for now).
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```console
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$ cu -l /dev/cuaU0 -s 115200
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```
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To save you another manpage lookup, exit the serial console
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with <kbd>Enter</kbd>, <kbd>~.</kbd>.
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Boot the Raspberry Pi with no SD-Card plugged in but the USB stick.
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1. Stop the autoboot process at the bootloader by typing something at
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the boot prompt (and delete the typed characters afterwards)
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2. Plugin the SD-Card and hit <kbd>Enter</kbd>
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3. The Installation media starts and detects your SD-Card
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4. Continue with the installation of OpenBSD
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We booted without SD-Card because I had problems selecting the USB media for booting.
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You can select this from within Raspbian OS but I did not want to install this in the
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first place.
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## System configuration
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Make sure to enable ssh. We will need that because we have to drop support for the
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serial console to use the MMDVM hat.
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## Disable the use of the serial console
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Modify `/etc/ttys` (only the first lines are relevant)
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```aconf {linenos=inline,hl_lines="6"}
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#
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# $OpenBSD: ttys,v 1.2 2020/03/13 13:14:40 patrick Exp $
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#
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# name getty type status comments
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#
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console "/usr/libexec/getty std.115200" vt220 off secure
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ttyC0 "/usr/libexec/getty std.9600" vt220 off secure
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ttyC1 "/usr/libexec/getty std.9600" vt220 on secure
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ttyC2 "/usr/libexec/getty std.9600" vt220 on secure
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```
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Change **on** to **off**. Now select the framebuffer device
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for your tty.
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```console
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$ echo "set tty fb0" | doas tee /etc/boot.conf
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```
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Once you made sure that you can login via ssh, turn off the Raspberry Pi and put on the
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MMDVM hat.
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Now you should be able to select `/dev/cua00` as the modem
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in your `MMDVM.ini`.
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## Setup DMRHost
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### Installation
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Get the files: <https://github.com/BrandMeister/DMRHost>.
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I prefer to use a separate user for this.
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```console
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$ doas useradd -L daemon -G dialer,users -m -d /home/mmdvm -s /sbin/nologin -c "Radio &" mmdvm
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```
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Now, let's create the DMRHost executable.
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```console
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$ cd /home/mmdvm
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$ doas -u mmdvm (mkdir git && cd git)
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$ doas -u mmdvm (git clone https://github.com/BrandMeister/DMRHost && cd DMRHost)
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$ doas -u mmdvm (mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Release ..)
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$ doas -u mmdvm make && doas make install
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```
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**Note**: the last command is not executed as the user _mmdvm_
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but as _root_ as it is installing the executable into `/usr/local/bin`.
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Therefore we dropped the `-u mmdvm` on the last `doas` invocation!
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### Configuration of DMRHost: `MMDVM.ini`
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I use `/home/mmdvm/MMDVM.ini` because I'll put everything MMDVM-related
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into `/home/mmdvm`.
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The essential congiguration changes:
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```ini
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[...]
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[Log]
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# Logging levels, 0=No logging, 1=Debug, 2=Message, 3=Info, 4=Warning, 5=Error, 6=Fatal
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SyslogLevel=0
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DisplayLevel=0
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FileLevel=2
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FilePath=/home/mmdvm/logs
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FileRoot=DMRHost
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FileRotate=0
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[...]
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[Modem]
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Port=/dev/cua00
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Protocol=uart
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[...]
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```
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This is basically the same configuration as in the repository.
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Have a look at the `[Log]` section.
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### The rc script `/etc/rc.d/DMRHost`.
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```bash
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#!/bin/sh
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DMRHOST="/usr/local/bin/DMRHost"
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MMDVM_INI="/home/mmdvm/MMDVM.ini"
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DMRHOST_PID="/home/mmdvm/DMRHost.pid"
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DOAS="/usr/bin/doas -u mmdvm"
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LOGDIR="/home/mmdvm/logs"
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case "$1" in
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"start")
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if [ ! -d ${LOGDIR} ] ; then
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mkdir ${LOGDIR}
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chown mmdvm:users ${LOGDIR}
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chmod 0775 ${LOGDIR}
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fi
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if ${DOAS} [ ! -r ${MMDVM_INI} ] ; then
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echo "${MMDVM_INI} is not readable... aborting!"
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exit 1
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fi
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echo "Starting DMRHost..."
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${DOAS} ${DMRHOST} ${MMDVM_INI} &
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echo $! > ${DMRHOST_PID}
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echo "done"
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;;
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"stop")
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echo "Stopping DMRHost..."
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if [ -f ${DMRHOST_PID} ] ; then
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kill `cat ${DMRHOST_PID}`
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rm -f ${DMRHOST_PID}
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echo "done"
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else
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echo "not running?"
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fi
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;;
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"restart")
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echo "Restarting DMRHost..."
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$0 stop
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sleep 2
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$0 start
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;;
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*)
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echo "$0 [start|stop|restart]"
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;;
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esac
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```
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### First test / first start
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Start DMRHost (not the service)
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```console
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$ doas -u mmdvm /usr/local/bin/DMRHost /home/mmdvm/MMDVM.ini
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```
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and see what it does. If it's logging into the master,
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all is good and can be stopped with <kbd>CTRL</kbd>+<kbd>C</kbd>.
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### Enable and start the service
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```console
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$ doas rcctl enable DMRHost
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$ doas rcctl start DMRHost
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```
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DMRHost runs.
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## Some additional notes
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I put myself (another user on the Raspberry Pi) into
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the _users_ group and chmod the `MMDVM.ini` with with 664.
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That allows me to edit the file as my usual user and I do
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**not** have to use `doas -u mmdvm` everytime I want to
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modify something in that file.
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