m# dymoweb WebServer to host a simple web page to print labels

It presents a web server on port 80 of the localhost and prints labels on a Dymo Label-manager.

I use the excellent (and fast) Perl package to print to Dymo Labelmakers by FireDrake (with some local additions of my own to allow for line padding). Use the version that I modified because it has specific code that allows it to print without buffering through and leaving streaky lines in the output.

One-Time Config Steps for new PI

For Wifi, change to /boot/wpa_supplicant.conf

We want to make it easy for them to add/configure their wifi password on a headless RPI. Since most Windows and Macs cannot read Linux file systems, we want to make the wireless security config file to reside on the boot partition, which is a Windows partition.

If they want to then change the WIFI key or add one (because they don't remember it when I initially configure it), they just pop the microSD card in their PC and write that file.

As user:

Make sure that an entry for the new WIFI networks is present in the /etc/wpa_supplicant/wpa_supplicant.conf file. An entry looks like one of these (unsecured or secured)

network={
	ssid="simunsec"
	key_mgmt=NONE
}

network={
	ssid="Pretty Fly for a WiFi"
	psk="PASSWORDKEY"
	key_mgmt=WPA-PSK
}

Here is the script to copy and paste in a terminal (as normal user):

sudo rm -f /boot/wpa_supplicant.conf
sudo mv /etc/wpa_supplicant/wpa_supplicant.conf /boot
sudo ln -s /boot/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf

Change Hostname

We need to make the change in two files:

• /etc/hostname
• /etc/hosts

Set the following variable, for example:

export NEWHOST="newpi"

Now copy and paste these lines.

sudo sh -c "echo ${NEWHOST} > /etc/host"
sudo sed -i.bak "s/127\.0\.1\.1[ \t]*.*/127.0.1.1\t${NEWHOST}/" /etc/hosts

Building from Source

PreReq: Perl Imager module

Install curl, cpanm and then the Imager module.

sudo apt-get -y install curl gcc-4.7
sudo curl -L http://cpanmin.us | perl - --sudo App::cpanminus
sudo cpanm Imager

The last line takes a bit of time to complete, even on an RP3.

Snarfed this advice from https://www.raspberrypi.org/forums/viewtopic.php?f=34&t=13410

Install Fonts (esp Comic-Sans :-)

sudo apt-get -y install ttf-mscorefonts-installer

Configure UDEV and Set Permissions

sudo bash -c "cat > /etc/udev/rules.d/50-dymo.rules" <<ENDFILE
SUBSYSTEM=="hidraw", \\
    ACTION=="add", \\
    MODE="0666", \\
    ATTRS{idVendor}=="0922", \\
    ATTRS{idProduct}=="1002", \\
    GROUP="plugdev", \\
    SYMLINK+="dymo"

SUBSYSTEM=="usb", \\
    ACTION=="add", \\
    MODE="0666", \\
    ATTRS{idVendor}=="0922", \\
    ATTRS{idProduct}=="1002", \\
    GROUP="plugdev", \\
    SYMLINK+="dymoReset"
ENDFILE

sudo udevadm control --reload-rules && sudo udevadm trigger

sleep 10

sudo chmod a+rw /dev/hidraw*

Add user PI to group LP

This needs to happen because the dymoReset device points to a device file that is owned by root,lp. It has group write privileges, so in order for our USB reset bit of code to work, we have to be part of the "lp" group.

sudo adduser pi lp

Supervisord -- Additional install

• Install supervisord according to this linked repo

• Copy the dymoweb.conf file to the /etc/supervisor/conf.d/ directory.

• Reboot to get supervisord working and the dymoweb server working

This will make it so that the web server starts up at boot time and it's monitored, and logged. Log files are in /var/log/dymoweb.{err,out}.log

Misc

Finished on [2017-03-05 SUN 04:12]

Date	Description
[2017-03-05 SUN 19:25]	Added supervisord config and more README.md documentation.
[2017-03-05 SUN 20:08]	Added more setup instructions.
[2017-04-09 SUN 09:13]	Added wifi setup instructions