Cannot send commands to child after a while

XBee & XBee Gateway XBee - Zigbee
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1

Dear Sirs,

I am using xbee3 zigbee as coordinator and several Texas Instrument cc2530 end devices.

I am using xbee3 connected to raspberry pi through serial communication. After a while (1-2 days), one and then two and then all end device stop receiving commands from coordinator.

To be more precise, when end device are still receiving commands:

  1. when they send measurements (end device are sensors):
    “type: 145,
    remote64: ‘00124b001735a8cc’,
    remote16: ‘5a02’,
    sourceEndpoint: ‘02’,
    destinationEndpoint: ‘02’,
    clusterId: ‘0001’,
    profileId: ‘ffff’,
    receiveOptions: 16,
    data:
    }
    115,101,110,115,82,58,48,48,49,50,52,66,48,48,49,55,51,53,65,56,67,67,104,117,109,58,56,53,46,54,116,101,109,112,58,49,53,46,54,56,67,0
    0: sensR:00124B001735A8CChum:85.6temp:15.68C”

  2. and when sending commands:
    “query: [Object: null prototype] { cmd: ‘ATplusUCAST:00124B001735A8CC,S’ }
    cmd: AT+UCAST:00124B001735A8CC,S addr: 00124B001735A8CC
    query: [Object: null prototype] {}
    >> {
    type: 139,
    id: 1,
    remote16: ‘5a02’,
    transmitRetryCount: 0,
    deliveryStatus: 0,
    discoveryStatus: 64
    }
    >> {
    type: 145,
    remote64: ‘00124b001735a8cc’,
    remote16: ‘5a02’,
    sourceEndpoint: ‘02’,
    destinationEndpoint: ‘02’,
    clusterId: ‘0001’,
    profileId: ‘ffff’,
    receiveOptions: 16,
    data:
    }
    83,101,110,115,111,114,67,58,48,48,49,50,52,66,48,48,49,55,51,53,65,56,67,67,44,83,50,32,86,68,68,50,52,51,50,52,32,79,75,0
    37: SensorC:00124B001735A8CC,S2 VDD24324 OK”

After 1-2 days, when end device are no longer responding to commands:
3) when they send measurements, I get:
“type: 145,
remote64: ‘ffffffffffffffff’,
remote16: ‘3cb4’,
sourceEndpoint: ‘02’,
destinationEndpoint: ‘02’,
clusterId: ‘0001’,
profileId: ‘ffff’,
receiveOptions: 16,
data:
}”

remote64 field has no longer 64-bits address.

  1. When I try to send command (I am using only 64-bits address to send commands), I get: “query: [Object: null prototype] { cmd: ‘ATplusUCAST:00124B0019A5F3A3,S’ }
    cmd: AT+UCAST:00124B0019A5F3A3,S addr: 00124B0019A5F3A3
    >> {
    type: 139,
    id: 1,
    remote16: ‘fffd’,
    transmitRetryCount: 0,
    deliveryStatus: 36,
    discoveryStatus: 1
    }”

It seems that xbee loses end devices 64bit addresses.

If I power off and power on after a while raspberry pi+xbee, the problem is solved and end devices receive correctly the commands sent by xbee.

What could be the problem?

2

Check your sleep timing settings on both the end devices and the Coordinator. They should match.

3

Thank you very much for your answer.

Now I am not quite sure which sleep timing setting should I correct.

End devices sleep 1min. before polling for any command.

Xbee coordinator sleep timing settings:
SM: no sleep
SP: AF0
ST: 1388
SN: FFFF
ET: 2 minutes.

SP=AF0=28 seconds which is lower than 1 minute but my application keeps sending commands through xbee to end devices during 5 minutes, until it gets an answer. And it works during 2-3 days.

On top of that, child poll timeout is at the maximum, 2 months, and not 2-3 days.

Does it have anything to do with NT that is equal to 3C ?

I got also for the first time this error yesterday: “java.lang.IllegalArgumentException: 64-bit address cannot be unknown.” Maybe it has nothing to do with this problem…

May it be a firmware bug? I am using zigbee v1009.