get rssi api mode digimesh

I have a digimesh network using xbee pro s1 with latest digimesh firmware (2.4 ghz), I cant set the discovery option to append rssi, nor I cant get the value. I searched documentation and there is not any sample about how to get it.
I got some devices conected to raspberry pi 3, using digi-xbee python api, others are just connected to enroute messages, and finally one attached to laptop where via Xctu can send AT commands and get the rssi, but couldn´t make it from the raspi (using api). Will like to get the Rssi value from each message received, and get the rssi value with the response of at command DB, so can send to a node the command and receive the rssi value of that device.
Please help!