Hi, made the tests...

Can ping printer.
Nmap shows open ports 9100 9101 9102 and 80

Cups snmp seems correct

network socket://192.168.1.100:9100 "HP Officejet 4500 G510n-z"
"Officejet 4500 G510n-z" "MFG:HP;MDL:Officejet 4500
G510n-z;CMD:MLC,PCL,PML,DW-
PCL,DESKJET,DYN;1284.4DL:4d,4e,1;CLS:PRINTER;DES:CN547A;SN:CN0CKH82QS05HR;S:038000C484001021002c1f30000c2e8004e;J:
;Z:0102,05037dc10136a1,0600,0c0,0e00040000,0f00c00000,10000002000002,12000,143,150;"
""

Cups dnssd gives

DEBUG: sent=0, count=0

that I don't know how to interpret, but maybe is what expected

lpinfo and avahi-browse all find the printer

activating debugging, cups error log shows no error and merely stops
being filled at a certain point

Cups filters the data regularly.

As a matter of fact, issues start when I try to send raw data to the
printer

lp -d <printer> -oraw <file>

does not work either using pcl files that the printer should understand or text 
files.
Job immediately goes in held status and if resumed remains in 'pending' status 
forever

Sending stuff with nc does not work either

nc -w1 <printer> 9100 < <file>

where printer is my printer ip address and file is either a pcl or a
text file hangs.

>From these test, I would tend to think that the printer is broken,
wasn't it for the fact that

1) It properly communicates with the computer when used as a scanner
2) When I borrowed a mac to make some tests, it printed wireless from it with 
no issues
3) status pages from the printer are all OK

This is driving me crazy...  I believe that at this point I should
borrow another HP wireless printer to test... but I cannot find anywone
to borrow it from.

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https://bugs.launchpad.net/bugs/1245162

Title:
  printing hangs reporting 'processing'

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