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381 lines
8.7 KiB
381 lines
8.7 KiB
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title = 'DMRHost on a RaspberryPi 4 with OpenBSD or FreeBSD'
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summary = '''A rather quick demonstration of my recent test to install
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DMRHost on a Raspberry Pi 4 which is running OpenBSD 7.3'''
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aliases = [ '2023-08-26-dmrhost-on-a-raspberrypi4-with-openbsd' ]
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date = '2023-08-26T19:07:53+0200'
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lastmod = '2023-09-03T07:45:34+0000'
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categories = [ 'amateur-radio' ]
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tags = [ 'hotspot', 'raspberry-pi', 'mmdvm', 'dmr', 'openbsd' ]
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+++
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## OpenBSD
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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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# rc-script for DMRHost on OpenBSD 7.3
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# Dominic Reich <https://oe7drt.com>
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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 -n "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 -n "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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$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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## FreeBSD
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{{< alert >}}
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This section is probably not complete, I had several problems with the
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Raspberry Pi's UART when I finally gave up on the long-term testing.
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{{< /alert >}}
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I'm using 14.0-CURRENT for this (which is moving to stable soon).
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<https://download.freebsd.org/ftp/snapshots/arm64/aarch64/ISO-IMAGES/14.0/>
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```console
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$ doas dd if=FreeBSD-14.0-ALPHA3-arm64-aarch64-RPI-20230825-2af9390e54ed-265022.img of=/dev/rsd2c bs=1m
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```
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Boot into the system with the serial console. Setup a dedicated user for this and
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disable the serial console after you successfully set up the network (don't forget
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to also test ssh connection).
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```console
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$ doas pw useradd mmdvm -d /home/mmdvm -m -L daemon -G dialer
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```
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Do not use the UART for kernel messages.
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Add this line to your `/boot/loader.conf` file.
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```conf
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hw.fdt.console="NO"
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```
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Reboot so the serial console can be used for the MMDVM_HS hat.
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### Install DMRHost
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You will need a few packages before we can continue. This list could
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be incomplete because I try to remember them from brain memory...
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```console
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$ doas pkg install git gcc cmake
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```
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Goto `/home/mmdvm`, build and install DMRHost.
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```console
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$ doas -u mmdvm mkdir ~/git && cd /home/mmdvm/git
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$ doas -u mmdvm git clone https://github.com/BrandMeister/DMRHost.git
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$ cd DMRHost && doas -u mmdvm mkdir build && cd build
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$ doas -u mmdvm (cmake -DCMAKE_BUILD_TYPE=Release .. && make)
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$ doas make install
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```
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Create directories and the `MMDVM.ini` file.
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```console
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$ cd /home/mmdvm && doas -u mmdvm mkdir logs && chmod 0775 logs
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$ doas -u mmdvm nvim MMDVM.ini
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```
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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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I also add my user to the mmdvm group, so I can edit the MMDVM file.
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(Well, set file permissions to 0664)
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```console
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$ doas pw usermod <user> -G mmdvm
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```
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### Test DMRHost
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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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You may inspect the logfile beforehand: `tail -f /home/mmdvm/logs/DMRHost.log`.
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The startup of DMRHost should end with something like these lines:
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```log
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M: 2023-08-25 11:03:05.000 DMRHost-20220617-DMRHost is running
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M: 2023-08-25 11:03:15.000 DMR, Logged into the master successfully
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```
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### Setup an rc file
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```sh
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#!/bin/sh
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# rc-script for DMRHost on OpenBSD 7.3
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# runs on FreeBSD for now
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# Dominic Reich <https://oe7drt.com>
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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/local/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 -n "Starting DMRHost..."
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${DOAS} ${DMRHOST} ${MMDVM_INI} &
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echo $! | ${DOAS} tee ${DMRHOST_PID} > /dev/null
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echo " done"
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;;
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"stop")
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echo -n "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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$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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