I am currently attempting to use a XBee WIFI S6B, running Firmware Version 2026, to log analog sensor data to Device cloud. To save battery power, the module is set to cyclic sleep (5 mins asleep, 120 seconds awake). The long duration of the awake period is based on the release notes for 2026 which indicates that upon wakeup, for nodes associated with a WPA2 access point, it takes around 50 seconds to transmit a TCP packet - plus a buffer.
The system seems to work well for an hour or two and then stops logging data. As it is still sitting in the test board, connected to XCTU, I can change a awake period, rewrite and the problem disappears, albeit temporarily.
Possibly related to the problem - I do not understand the new sleep options (SO) introduced in 2026 and what should actually be entered on XCTU to force dissociation from AP on deep sleep.