RSSI Definition

[SDK_User_771]

Hi.

I have a quick question regarding the RSSI Value of Messages sent in a Bluetoth Mesh Network.

So my question is: How exactly is the RSSI Value defined and how does it correspond to the actual received signal power?

I know the definition given in the bluetooth LE specification but for mesh applications there doesn't seem to be a universal standardised definition but rather a vendor or in some cases even chip specific definition. For example a rssi value of -60 can have a totally different meaning for rf modules from different vendors.      

[Mttrinh]

Hi,

Sorry for the dealy in response.

As far as I know the definition should be the same as in bluetooth LE specification.

RSSI(Received Signal Strength Indicator) is a measurement of how well your device can hear a signal. It is measure the relative quality of a received signal to a client device, but has no absolute value. You are correct that each chipset manufacturer can define their own “RSSI_Max” value. It’s all up to the manufacturer which is why RSSI is a relative index, but you can infer that the higher the RSSI value is, the better the signal is.

EDIT:  RSSI value reported by the mesh stack is actually taken from the value reported by the underlying Bluetooth LE controller.