find-printer

Find Printer

Discover the HP DeskJet 5200 on the local network and update context/printer-config.md with the correct IP.

Strategy

1. Check current config — read context/printer-config.md for the current IP.
2. Test current IP — try ipptool against the configured IP. If it responds, confirm and stop.
3. ARP scan — if the current IP doesn't respond, scan the local subnet:

   # Get the local subnet
   ip route | grep -oP 'src \K[\d.]+' | head -1
   # ARP scan (prefer arp-scan if available, fall back to nmap -sn)
   sudo arp-scan --localnet 2>/dev/null || nmap -sn 192.168.1.0/24 2>/dev/null || arp -a
   

4. Identify HP device — look for MAC prefixes belonging to HP Inc (common prefixes: 00:1A:1E, 3C:D9:2B, 58:20:B1, 6C:C2:17, 80:CE:62, C8:D9:D2, D4:61:DA, F4:39:09) or hostnames containing HP or DeskJet.
5. Verify via IPP — for each candidate, probe port 631:

   ipptool -tv ipp://CANDIDATE_IP:631/ipp/print /tmp/hp5200-probe.test 2>&1 | grep -i "DeskJet"
   

   The IPP test file:

   {
   OPERATION Get-Printer-Attributes
   GROUP operation-attributes-tag
   ATTR charset attributes-charset utf-8
   ATTR naturalLanguage attributes-natural-language en
   ATTR uri printer-uri $uri
   ATTR keyword requested-attributes printer-make-and-model
   }
   

6. Update config — once found, update context/printer-config.md with the new IP and IPP URI.
7. Update CUPS — if the CUPS printer is pointing at the wrong IP:

   lpadmin -p HP-DeskJet-5200 -v ipp://NEW_IP:631/ipp/print -E
   

Output

Report the discovered IP, confirm CUPS is updated, and print a one-line summary.

If not found

Tell the user:

• Ensure the printer is powered on and connected to the same network
• Check if the printer has a static IP or DHCP reservation
• The user can manually set the IP in context/printer-config.md