Serious time drift in some configurations.

[volca02]

Especially Publishing Timers seems to sometimes cause a serious time drift, leading to CMAC inconsistencies and clients not able to send updates to the esp.

[volca02]

Some new light shed onto this issue: It seems the clients sometimes jump away in time after receiving a packet from the master - sometimes there's a response packet even though none was scheduled?! There probably is a bug in the scheduling code that causes sending sync packets as responses to malformed packets or similar.