[Nut-upsuser] Cyberpower/powerpanel error: Data stale

[Arjen de Korte]

Citeren Seann Clark <nombrandue at tsukinokage.net>:

> This output is after everything has been shut down and all NUT  
> related items killed out of memory after a init script being run to  
> stop the main items. The output of the debug is:
> debug level is '3'
> Trying binary protocol...
> read: (20 bytes) => 2e 4f 50 31 35 30 30 20 20 20 20 2e 78 2e 3c 2e 35 31
> 30 30
> CyberPower UPS with binary protocol on /dev/ttyS0 detected

The autodetection for the protocol works at least, it is reporting an  
OP1500 model.

> send: (3 bytes) => 52 02 0d
> read: (2 bytes) => 52 00
> send: (3 bytes) => 52 04 0d
> read: (2 bytes) => 52 00
> send: (3 bytes) => 52 08 0d
> read: (2 bytes) => 52 00
> send: (3 bytes) => 52 18 0d
> read: (2 bytes) => 52 00

Here a couple of settings from the UPS are read. It is using the table  
for the OP series, so this is correct too.

> send: (2 bytes) => 44 0d
> read: (14 bytes) => 23 7d 00 22 2e d6 80 b1 2e 09 f6 00 ff 0d
> dstate_init: sock /var/run/nut/powerpanel-cyberpower-ups open on fd 6
> send: (2 bytes) => 44 0d
> read: (14 bytes) => 23 7c 00 21 2e d6 7f b1 2e 09 f6 00 ff 0d
> send: (2 bytes) => 44 0d
> read: (14 bytes) => 23 7d 00 22 2e d6 80 b1 2e 09 f6 00 ff 0d
> send: (2 bytes) => 44 0d
> read: (14 bytes) => 23 7d 00 22 2e d6 80 b2 2e 09 f6 00 ff 0d

We succeeded to poll for the status four times in a row (without  
retries), so the communication is fine so far.

> send: (2 bytes) => 44 0d
> read: timed out
> Communications with UPS lost: Status read failed!

...but here the problems start.

It looks like we suddenly have developed a communication problem here,  
the UPS doesn't want to talk/listen to us anymore. Usually this has to  
do with the cable power for the UPS. Currently, the 'powerpanel'  
driver clears RTS and sets DTR. I noticed that both the 'cyberpower'  
and 'nitram' drivers set both. Could you try if changing line 93 in  
powerpanel.c to

	ser_set_rts(upsfd, 1);

fixes the problem? I suspect that clearing RTS might be a mistake here.

Best regards, Arjen
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