it can be anything

IF the text is a url, the client app offers to open it

so, you config the module with a dummy url
https://github.com/evghenix/MMM-QRCode

and the the script additions change it to the machine IP address at the time mm starts.

which the op’s daughter in college would not generally know.

if the machine was powered off for a day/week, it’s ip address would likely change, and so a hard coded ip address would be bad.

this code handles any dhcp address
change and then the qrcode launches remote controls expected

remember, until mm starts, the config.js is a useless text file

so the text above added to the mm.sh can update the config.js for the QRCode module before MM starts and all will be well…

here is a little script you can use to modify the config when MM is started

#!/bin/bash
#
# get the active adapter name
#
adapter=$(ip link show | grep mtu | grep -v lo | grep up | grep -v -i docker | grep "state UP" | awk -F: '{print $2}' | awk '{print $1}')
#
# use the adapter name to get the assigned IP address
#
address=$(ifconfig $adapter | grep "inet " | awk '{print $2}')
#
# use for debugging
# echo address for  adapter $adapter  is $address
#
# use the address in sed replace of the line that starts with text:"http:/
# -i means update file in place
# file at the end needs the path   (~/MagicMirror/config/config.js
#
sed -i "/text:\"http:/ c \    \"text\"\:\"http://$address:8080/modules/remoteControl.html\","  config.js

u could add this to the mm.sh used to start MM on boot,etc…
I don’t know the end of the remotecontrol link… so that has to be fixed too…
just have something in config.js when this runs , this should run before npm start

this works for ipV4… haven’t tried with ipV6 network
the grep "inet " filters out the v6 address “inet6” would select just that address

docs says

Because IPv6 addresses contain colons, they cannot be directly used in URLs because the colons would conflict with both the protocol declaration (http:// or https://) and port numbers. Therefore, when a literal IPv6 address is used, it is encased in a bracket, like http://[2001:db8::1]:80.

so that would be a tiny change to the sed string

do you think the pi address will change?