How to let a ZED join specific ZR ?

[embedholic]

Hi,

I am developing a solution with zigbee (nRF52840).

I want some end device is joined to specific router. 

In the documents, if end device find more than one router/coordinator, it selects more good-quality link(maybe RSSI?)  automatically.

I want setup network manually , something like to belows.

ZED_a want to b connected to ZR and ZED_d connected to ZC directly.

How can do that?

Thanks.

ZED_a--------ZR(b)------------ZC(c)

                                             |

ZED_d----------------------------+

[AndreasF]

Hi.

It is not possible manually set up that a sleepy end device will connect to a specific router.

The stack acts according to the specification. The ZED sends out Beacon Request and routers in the area responds with Beacon Responds and the ZED selects the router which has the lowest link margin.

Best regards,

Andreas

[embedholic]

Thanks.

I have two questions about real circumstances.

1.

If zigbee spec can not support such function, how can prevent not-authorized zed to join to our coordinator?

I already made question about "zdo_mgmt_leave_req"  in this community.

2. 

How to prevent my ZED from joining neighbor coordinator ?

[AndreasF]

Hi.

1.

You can use Installation Codes, read more about it in the infocenter.

If zb_set_installcode_policy() is set in the coordinator, then you only allow devices that have installation code to join.

zb_secur_ic_set() is used in the ZED to set the installation code.

zb_secur_ic_add() is used in the coordinator to add a ZED with long address to the device and the installation code set in the ZED device.

2.

You can for example use the installation code.

Best regards,

Andreas