We are using XBee 868 to connect to sensors, some of which are on battery, so we want to minimize the power use.
When building a mesh network (so we set the XBee's to synchronous sleep mode, SM 8 or SM 7), we try to set the wake time (ST) as short as possible.
It seems like there is a minimum wake time, because when we try to set it to less than 3 seconds it just sets it back to the same value (CA5, or 3237 ms).
The same is true if I try to set it via AT commands.
But I haven't found anything in the documentation stating a minimum wake time for synchronous sleep modes.
With asynchronous sleep modes we have no problem setting the wake mode to shorter values than this.
Thanks in advance,