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Problem: Some spots is unable to deepsleep Cause: some spot properties prevent from deep sleep Solution: spot.mesh.enable = false

https://www.sunspotworld.com/forums/viewtopic.php?p=8064&sid=b80a20f95ee74e2e3826834f25d542a6 https://www.sunspotworld.com/forums/viewtopic.php?t=306&highlight=energy http://www.sunspotworld.com/docs/Orange/javadoc/com/sun/spot/peripheral/IPowerController.html#getVbatt()

Java Concurrency Constructs What is the difference between sleep(), wait() and suspend()? wait(), sleep(int) and InterruptedException The notifyAll and wait Methods Using the notifyAll and wait Methods 

Problem: I got

Problem: Method "thresholdExceeded" always works even though we didn't move the spot or move the spot when it is in deepsleep. Cause: I suppose that the events occurred when we do move and wait for sending the messages when the receiver is available. Solution: Disable ThresholdEvent before starting in deepsleep mode -- accel.enableThresholdEvents(IAccelerometer3D.ALL_AXES, false);

Problem: When we use sleepMgr.ensureDeepSleep(...), it goes to UnableToDeepSleepException even we don't have any thread running. The error says that "another thread is runnable within x", Cause: Because of many system threads which run from time to time, sunspot won't let us do ensuredeepsleep. Solution: We just call the command to block every thread running which is Thread.sleep(...) or Utils.sleep(...). Then, the spot will go to deepsleep. Note: In my experiment, OTA doesn't affect with deepsleep mode. References: https://www.sunspotworld.com/forums/viewtopic.php?p=7755