[BackupPC-users] BackupPC_serverMesg has no effect?

Running backuppc 3.3.0-2+deb8u1 on Debian GNU/Linux 8.8 Jessie.

Used command
/usr/share/backuppc/bin/BackupPC_serverMesg backup 192.168.42.2 humppa backuppc 1
to force full backup.

The request appears in the log but seems to have no effect.

2017-07-21 15:07:47 Unknown command backup humppa backuppc 1
2017-07-21 15:09:38 User backuppc requested backup of humppa (192.168.42.2)
2017-07-21 16:00:00 Next wakeup is 2017-07-21 17:00:00
2017-07-21 17:00:00 Next wakeup is 2017-07-21 18:00:00
2017-07-21 18:00:00 Next wakeup is 2017-07-21 19:00:00
2017-07-21 19:00:00 Next wakeup is 2017-07-21 20:00:00
2017-07-21 20:00:00 Next wakeup is 2017-07-21 21:00:00
2017-07-21 20:00:26 Started incr backup on alice (pid=9291, share=/)
2017-07-21 20:13:03 Started incr backup on alice (pid=9291, share=/opt/Varasto3)
2017-07-21 20:28:53 Started incr backup on alice (pid=9291, share=/opt/Varasto4)
2017-07-21 20:29:06 Started incr backup on alice (pid=9291, share=/opt/Varasto)
2017-07-21 20:30:15 Started incr backup on alice (pid=9291, share=/opt/Varasto1)
2017-07-21 20:30:16 Finished incr backup on alice
2017-07-21 20:30:16 Running BackupPC_link alice (pid=9488)
2017-07-21 20:30:20 Finished alice (BackupPC_link alice)
2017-07-21 21:00:01 Next wakeup is 2017-07-21 22:00:00
2017-07-21 21:45:02 User backuppc requested backup of humppa (192.168.42.2)
2017-07-21 22:00:01 Next wakeup is 2017-07-21 23:00:00
2017-07-21 23:00:01 Next wakeup is 2017-07-22 01:00:00

The second request at 21:45 is from cron. I was expecting the backup to start at next wakeup or when blackout period ends at the latest.

The backup for humppa finally starts at 01:48, but this is from normal schedule.

2017-07-22 01:44:29 Started incr backup on humppa (pid=10391, share=/)
2017-07-22 01:48:51 Finished incr backup on humppa

I tried to force the full backup to run friday night, but seems the serverMesg backup does not have any effect. I googled for old mailing list entries, and found about serverMesg and the syntax it uses. I also read this is the way backups should be started from command line, and not using BackupPC_dump.

The reason I am trying to do this from cron is to correct the tendency of the backup start times to creep forward. Eventually the full backups start so late in the monday morning they are still running during working hours. I remember I read about this in this mailing list sometime previously, but did not find that list entry now that I tried to do it myself.

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