Adding Laser Jet Pro MFP M277dw on Linux Mint

[turboscrew]

My postins seem to have disappeared lately, so once more...

I've been trying to add the printer as a network printer in Linux Mint (17.3) by name instead of by IP address, and some questions have arisen.

1) What are the two devices whose MAC address I keep seeing in my DHCP server? One doesn't seem to respond and the other has 7 services.

2) The hplip (3.17.11) doesn't work. It finds no printers even if the "system-config-printer" works (if I give it the IP address - it still can't find printers, but printing works). How can I find out what's wrong?

3) Is it possible to add the printer by name? The DHCP server gives the name "NPIB88B68". Is it the host name or print queue name? That is, what should I use as a URI?

[turboscrew]

Funny, the hplip started working apparently by itself!

So question 2) became obsolete.

[turboscrew]

Anyone? (Questions 1 and/or 3.)

[turboscrew]

Another funny thing: If I check the status or supplies via the GUI, I get
"Status information not available for this device"
and
"Supplies information not available for this device"

If I open its IP (the one with "active" MAC address) with a web browser, I can see it all, and CUPS prints fine.

And:

Current contents of '/etc/hp/hplip.conf' file:
# hplip.conf.  Generated from hplip.conf.in by configure.

[hplip]
version=3.17.11

...

---------------------------------
| INSTALLED CUPS PRINTER QUEUES |
---------------------------------

 
HP_Color_LaserJet_MFP_M277dw
----------------------------
Type: Printer
Device URI: hp:/net/HP_Color_LaserJet_MFP_M277dw?ip=192.168.0.150
PPD: /etc/cups/ppd/HP_Color_LaserJet_MFP_M277dw.ppd
PPD Description: HP Color LaserJet Pro MFP M277 Postscript (recommended)
Printer status: printer HP_Color_LaserJet_MFP_M277dw is idle.  enabled since Sun 26 Aug 2018 07:34:59 PM EEST
Required plug-in status: Installed
Communication status: Good

HP_Color_LaserJet_MFP_M277dw_fax
--------------------------------
Type: Fax
Device URI: hpfax:/net/HP_Color_LaserJet_MFP_M277dw?ip=192.168.0.150
PPD: /etc/cups/ppd/HP_Color_LaserJet_MFP_M277dw_fax.ppd
PPD Description: HP Fax2 hpcups
Printer status: printer HP_Color_LaserJet_MFP_M277dw_fax is idle.  enabled since Sun 26 Aug 2018 07:34:59 PM EEST
Required plug-in status: Installed
Communication status: Good

[turboscrew]

The mystery of two interfaces is solved.

The non-responsive entry was my cellphone, to which my router gave the same name as my printer has.

Don't know why.

So only the question about addíng a printer by name instead of IP number still remains.