Re: [Printing-architecture] PAPPL 1.2rc1 (Supply levels)

Michael Sweet <[email protected]> Tue, 17 May 2022 08:45:25 -0400
Newsgroups	dev.linux.lists.printing-architecture
Message-ID	<[email protected]>
James,

So "socket://ip-or-hostname" works but "snmp://name" doesn't?

Can you send me (privately) a wireshark or tcpdump capture showing the runs?  The SNMP "backend" in PAPPL is using the Host MIB to find the named printer and use the response address as the printer's local IP address.  It is a pitiful backup to DNS-SD and mDNS discovery, but a somewhat necessary one given that certain popular label printers from a vendor whose name starts with the last letter of the alphabet doesn't implement mDNS nor do they provide an easy way to configure a static IP for their network interfaces... :(



> On May 16, 2022, at 4:02 PM, James Cloos <[email protected]> wrote:
> 
>>>>>> "MS" == Michael Sweet via Printing-architecture <[email protected]> writes:
> 
> MS> It looks like the change was made in CUPS 2.2.7 to use the new name.
> MS> I've pushed a workaround to the PAPPL repository - please let me know
> MS> whether that fixes things for you.
> 
> cups 2.4.0_pre refused to emergem but 2.3.3_p2-r3 succeeded.
> 
> before that, there was still another failure due to the older cups.
> 
> but pappl compiles fine with 2.3.3_p2-r3 installed.
> 
> on all of the boxen snmp:// fails even though socket:// uses snmp to get
> its data.
> 
> strace shoes that it succeeds in gettig snmp date, but it prints
> nothing.
> 
> the strace output ends with:
> 
> recvfrom(3, "00\2\1\0\4\6public\242#\2\1\4\2\1\0\2\1\0000\0300\26\6\20+\6\1\4\1\225\v\1\2\1\3\1\1\6\1\1\2\2\2\3", 1472, 0, {sa_family=AF_INET, sin_port=htons(161), sin_addr=inet_addr("192.168.1.5")}, [256 => 16]) = 50
> pselect6(4, [3], NULL, NULL, {tv_sec=2, tv_nsec=0}, NULL) = 1 (in [3], left {tv_sec=1, tv_nsec=990743222})
> recvfrom(3, "0+\2\1\0\4\6public\242\36\2\1\4\2\1\2\2\1\0010\0230\21\6\r+\6\1\4\1\205+\6\3\1\4\21\0\5\0", 1472, 0, {sa_family=AF_INET, sin_port=htons(161), sin_addr=inet_addr("192.168.1.5")}, [256 => 16]) = 45
> pselect6(4, [3], NULL, NULL, {tv_sec=2, tv_nsec=0}, NULL) = 0 (Timeout)
> pselect6(4, [3], NULL, NULL, {tv_sec=2, tv_nsec=0}, NULL) = 0 (Timeout)
> close(3)                                = 0
> exit_group(1)                           = ?
> +++ exited with 1 +++
> 
> (that trace is from my magicolor.  my cheap inkjet shows a similar end.)
> 
> -JimC
> --
> James Cloos <[email protected]>         OpenPGP: 0x997A9F17ED7DAEA6
> 

________________________
Michael Sweet
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