HP M234sdw does not print on port 9100 connection

[SMFabac]

The new purchase HP MFP M234sdw installed at my client's office on the network will not print ASCII  jobs sent via RAW port 9100 printing.   I've been in HP web site hell trying to get an answer on this issue.   As I write this post it occurs to me that this must be a brain dead "Windows" printer that requires driver software to create a bit-mapped page image in Computer memory and dump a raster scan to the printer. I have had that unfortunate problem when another client purchased a Brother MFC-L2700DW printer.  I had recommended to the client to "buy HP" to avoid problems printing over the network from her UNIX system.  We use a program named netcat  to send print jobs.  When 9100 is disabled in "advanced" tab we get the following message saying  "Connection refused." With 9100 enabled, the only difference is no "connection refused" message but the job still does not print.   In my opinion "Buy HP" is not a good recommendation.  Used to be you could call HP for post sales support issues. That's a thing of the past. 

# head -30 /etc/ptest | xtod | /usr/local/bin/netcat -d 3 -h hp2 -p 9100
debugl = 3
hostname = hp2
port = 9100
gethostbyname()=0x800cb870
socket()=3
sin.sin_addr.s_addr=0xaf6fa8c0
connect()=-1
Connect to port 9100 on hp2: Connection refused
socket()=3
sin.sin_addr.s_addr=0xaf6fa8c0
connect()=0
read()=1024
write()=1024
read()=1024
write()=1024
read()=293
write()=293

[SMFabac]

Well HP  does not care.  I found my own answer by checking the printer language in the specifications and it lists PCL5ms but not PCL5.  Googling found posts on this community (  https://h30434.www3.hp.com/t5/LaserJet-Printing/PCLms-Supports-PCL5-commands/td-p/6253366 )  that confirms that PCLms is not compatible with my client's UNIX system.  Do you think that they can have a note in the  embedded web server that makes this clear. I've advised the client to box it up and take it back and be sure to have the sales agent confirm PCL5 compatibility.