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CC2538: When sending an OTA "Image Block Response" command with "relayCnt" of 2 and 64 bytes of data, the sending function returns "ZMemError (0x10)".

Part Number: CC2538
Other Parts Discussed in Thread: Z-STACK, SIMPLELINK-CC13X2-26X2-SDK
Protocol stack: Z-Stack 3.0.2
Coordinator processor: CC2538
Enddevice processor: CC2530
1、Problem Description:
Coordinator turns on "MTO" function and encryption function. When the coordinator sends an "Image Block Response" command with "relayCnt" of 2 and 64 bytes of data, the sending function will return "ZMemError (0x10)".
When the number of hops to send a command is less than 2, it can be sent successfully.
How many bytes of data can Zigbee send at one time? Wouldn't it fragmentate automatically if the "Fragmentation" function was turned on?