[hylafax-users] How to get around "Stop and wait" failures

[Sebastian Birnbach <birnbacs@xxxxxx>]

All,


it took me quite a while to figure this out, so I guess the best thing 
will be to post it to this list.
After setting up Hylafax 4.2.1 (own compilation) on Solaris8 and trying 
to make it work with a Robotics Sportster faxmodem, I kept getting 
errors like this in the logs (/var/spool/hylafax/log/c0000*):

[...]
Feb 16 15:20:06.14: [  528]: SEND file "docq/doc29.ps;00"
Feb 16 15:20:06.14: [  528]: USE A4 page width (215 mm)
Feb 16 15:20:06.14: [  528]: USE A4 page length (297 mm)
Feb 16 15:20:06.15: [  528]: USE 3.85 line/mm
Feb 16 15:20:06.15: [  528]: USE 1-D MH
Feb 16 15:20:06.15: [  528]: SEND training at v.29 9600 bit/s
Feb 16 15:20:06.15: [  528]: <-- [9:AT+FTH=3\r]
Feb 16 15:20:06.29: [  528]: --> [7:CONNECT]
Feb 16 15:20:06.29: [  528]: <-- data [23]
Feb 16 15:20:06.29: [  528]: <-- data [2]
Feb 16 15:20:08.03: [  528]: --> [7:CONNECT]
Feb 16 15:20:08.03: [  528]: <-- data [6]
Feb 16 15:20:08.03: [  528]: <-- data [2]
Feb 16 15:20:08.73: [  528]: --> [2:OK]
Feb 16 15:20:08.73: [  528]: <-- [9:AT+FTS=7\r]
Feb 16 15:20:08.99: [  528]: --> [5:ERROR]
Feb 16 15:20:08.99: [  528]: MODEM Command error
Feb 16 15:20:08.99: [  528]: Stop and wait failure (modem on hook)
Feb 16 15:20:08.99: [  528]: The destination appears to have trouble 
with V.34-Fax.
[...]


Interestingly, the /usr/local/sbin/probemodem script had previously 
detected that the AT+FTS command could not be digested by my modem. You 
can run that script at any time to find out what AT capabilities your 
modem has.

My modem is configured by file /var/spool/hylafax/etc/config.cua_b. I 
added the following lines to stop HylaFAX attempting to use AT+FTS commands:


Class1PPMWaitCmd:       "<delay\0727>"  # \072 == : to avoid awk problem
Class1TCFWaitCmd:       "<delay\0727>"
Class1EOPWaitCmd:       "<delay\0729>"
Class1SwitchingCmd:     "<delay\0727>"  # assumption: +FRS not supported


Probably, the Class1ResponseWaitCmd attribute can be supplied with such 
a value. In my current setup, I still see AT+FRS commands and 
corresponding errors, but only during the training phase. Apart from 
this, everything works fine.


I hope this helps other people, and if there is any HylaFAX developer 
reading this, you may want to check if this is not a bug during 
automatic modem configuration and setup.



Thanks to klaus_h on 
http://www.debianforum.de/forum/viewtopic.php?t=37422, who brought me to 
the solution.



	Sebastian Birnbach

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