how to get scanned network strength over dbus

I am trying to get a listing of ssid Dbm values for my UI. I an trying
to write a python script to do that and ran across the ones in the iwd
directrory
https://git.kernel.org/pub/scm/network/wireless/iwd.git/tree/test
I copied get-diagnostics and ran it and it works for the conneced
network. How do I get the dBm values for all scanned networks?
# python3 get-diagnostics.py /net/connman/iwd/0/3
ConnectedBss : a6:2e:48:fd:9e:73
RSSI : -57 dBm
TxBitrate : 292500 Kbps
RxBitrate : 292500 Kbps

but I want this for all the scanned networks... Is this possible
across the dBus?
if I disconnect the network and try again, I get this:
# python3 get-diagnostics.py /net/connman/iwd/0/3
Traceback (most recent call last):
  File "/root/bob/get-diagnostics.py", line 27, in <module>
    diagnostics = device.GetDiagnostics()
                  ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 72, in __call__
    return self._proxy_method(*args, **keywords)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 141, in __call__
    return self._connection.call_blocking(self._named_service,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 634,
in call_blocking
    reply_message = self.send_message_with_reply_and_block(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NotFound: No
matching method found

I get something similar if I put the ascii name of the network there as well:
# python3 get-diagnostics.py /net/connman/iwd/0/3/73706735_psk

Is there a way?

Keith