What does RSSI log of health model mean?

[Jeffery]

Hi Nordic team

At section 4.4.3 of Mesh profile spec, it said "This health model is used to represent a mesh network diagnostics of a device."

I tried SDK mesh v5.0.0 provisioner example to provision light switch server examples.

At the log of provisioner node, we can see each light node report and fault and RSSI periodically.

Q1.

What does the RSSI mean? RSSI value is between the light node directly and provisioner node?

Or, between the light node and other node to relay message in the neighborhood?

Q2. 

Can we refer to this RSSI value when set up a real mesh network? To judge if the node is in the range of other relay nodes.

What is the minimum value you suggested? 

Q3. 

In my mesh network, phone apps "nrf mesh" is provisioner. Not a standalone provisioner.

If I want light switch client node to diagnose the health of all light switch server nodes, what shall I do is to add health client model

at light switch client node?  Shall I set app key and same group address at phone to health client model at light switch client node?

Thanks.

Jeff

 

[Joakim Jakobsen]

Hi.

Q1:

The RSSI value is between the Light and the relay node, if the relay node is the node that receives and relays the message from the Light.

Q2:

Yes, you can refer to the RSSI values in your network. RSSI (Received Signal Strength Indication) can be used, as the name suggests, to get an indication to what the signal strenght is.

The RSSI is not the best option for accurate measurement of distance because physical obstacles, noice from other radio sources etc. will impact the RSSI. 

Q3:

Not sure if I understand the question. But if you have server nodes with the health model publishing its status, you can have your client node subscribe to thos nodes.

Br,
Joakim