Network Printer — every cartridge, in Homey.
Turn any network printer into a Homey device that tells you the ink is running out — before you find out halfway through printing.
Your printer knows exactly how much ink it has left. It just never mentions it until you are standing in front of it, and Homey has no idea the black cartridge is down to 20%.
This app reads the printer over SNMP — the protocol nearly every network printer already speaks, with nothing to install on it — and turns each cartridge into a Homey capability a Flow can act on.
There is nothing to look up: it searches your network and offers the printers that answer.
Test version
Source code 
What it does
One level per cartridge, titled with the cartridge’s own name — Black Ink Cartridge 202/202XL is what you order, not supply 2
Any brand — everything read comes from the standard Printer-MIB, so Epson, HP, Brother, Canon, Kyocera, Lexmark, Ricoh, OKI, Xerox and Samsung all work the same way
It finds the printer for you — a sweep of your network, and anything that answers is offered. You can still add one by address
Low-supply alarm at a threshold you choose per printer. It fires as the level crosses the threshold — once — not every time the printer is read
Error alarm for what actually stops printing: paper jam, out of paper, open cover, missing cartridge. Low-ink warnings stay out of it, since the supply alarm already covers them
Status, panel message and page counter — including the text on the printer’s own screen
Waste tanks reported as room left, so 100% always means nothing to do
One level per paper tray, named after the tray and the paper loaded in it — plus a paper-low alarm
Output tray — OK, half full or full, on printers that can sense it
Printer alerts — what the printer itself says is wrong, in its own words
Cover-open alarm
Nothing is hard-coded per model
The number of consumables, their names and their colours are discovered from the printer itself. A four-cartridge office printer and a nine-cartridge photo printer both work without a line of code between them — and so does a laser, where the same table reports toner and a waste box instead of ink.
Flow cards
A supply runs low — carrying which one, and its level- The status changes, optionally to one status in particular
- Pages have been printed, carrying how many
- The printer reports an error
A supply is below a level (condition)
Read the printer now (action)
Every capability above also gets its own Flow card automatically.
Requirements
Homey Pro — Homey Cloud and Homey Bridge cannot reach devices on your network, so they cannot reach a printer- SNMP left enabled on the printer — it is on by default on nearly every network printer, with the read community
public 
A fixed address for the printer — a changed DHCP lease is the most common reason a working printer goes quiet
Languages
English
French
Dutch
Feedback welcome
Running here against an Epson XP-6100 — five cartridges, read end to end: the sweep finds it, the levels come through with the cartridge names above, and the panel text and page counter with them.
That is one printer. The reading is standards-based rather than model-specific, so it should hold across brands — but a printer that reports its supplies oddly is exactly the thing I cannot find without you. If your levels look wrong, or your printer is not found at all, say so here: the app has a settings page that reads the printer live and shows what it sees, which usually settles it in one round trip.
Two known limits, stated plainly:
Read-only. It reports; it does not print. HomeyPrint already does printing over IPP- mDNS discovery does not work on every network. The app declares it, but multicast is filtered between wireless clients on many routers — mine included. The network sweep is what makes it work regardless, which is why both exist
What it looks like
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