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CC2530: ZNP how to use the same network after reboot

Part Number: CC2530
Other Parts Discussed in Thread: Z-STACK

I have this issue using ZNP where I initialize the chip and network (as Coordinator), get another device to join the network and then communicate with it. But the problem is that after that if I restart the device I can't communicate again. I have to do the whole network setup and get a new address.

I have tried calling this:

//Configure module to not erase network on reset.
setStartupOptions(0);

Which calls:
zbWriteConfiguration(ZCD_NV_STARTUP_OPTION, ZCD_NV_STARTUP_OPTION_LEN, data)

But it doesn't work.

Do I have to do any commissioning to use the network as it was before the restart?

Any Ideas?