I am trying to run an Express API server with sudo permissions and have it automatically start on boot.
The API needs access to bcm2835 library, and I get the following when trying to run node server.js
bcm2835_init: Unable to open /dev/mem: Permission denied /home/pi/Documents/node_modules/rpio/lib/rpio.js:104
Error: Could not initialize bcm2835 library
at bindcall (/home/pi/...) etc.
However it boots up fine running sudo node server.js.
I have created a service file at /etc/systemd/system as follows:
[Unit] Description=Node API After=network.target [Service] ExecStart=/usr/bin/node /home/pi/Documents/server.js Restart=always SyslogIdentifier=controller User=root Group=root Environment= TimeoutStopSec=30 [Install] WantedBy=multi-user.target
I found some guidance here and here, but they seem slightly off, since a sub-command needs sudo/root privileges.
service controller start from the command line it prompts for a username and password.
How can I run this service with proper permissions so it boots up with the Pi?