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Fix signal quality reporting with MBIMEx v2.0

Aleksander Morgado requested to merge aleksm/ModemManager:aleksander/fix-signal-quality-mbimex-v2 into master

When we enable MBIMEx v2.0, the "Signal State" responses and indications no longer report a valid RSSI value; and instead, they report per access technology RSRP/RSRQ values.

  >>>>>> Header:
  >>>>>>   length      = 116
  >>>>>>   type        = indicate-status (0x80000007)
  >>>>>>   transaction = 0
  >>>>>> Fragment header:
  >>>>>>   total   = 1
  >>>>>>   current = 0
  >>>>>> Contents:
  >>>>>>   service = 'basic-connect' (a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
  >>>>>>   cid     = 'signal-state' (0x0000000b)
  >>>>>> Fields:
  >>>>>>   Rssi = '99'
  >>>>>>   ErrorRate = '99'
  >>>>>>   SignalStrengthInterval = '5'
  >>>>>>   RssiThreshold = '2'
  >>>>>>   ErrorRateThreshold = '4294967295'
  >>>>>>   RsrpSnr = '{
  >>>>>>     [0] = {
  >>>>>>           Rsrp = '0'
  >>>>>>           Snr = '0'
  >>>>>>           RsrpThreshold = '4294967295'
  >>>>>>           SnrThreshold = '4294967295'
  >>>>>>           SystemType = '5g-nsa'
  >>>>>>     },
  >>>>>>     [1] = {
  >>>>>>           Rsrp = '49'
  >>>>>>           Snr = '45'
  >>>>>>           RsrpThreshold = '4294967295'
  >>>>>>           SnrThreshold = '4294967295'
  >>>>>>           SystemType = 'lte'
  >>>>>>     },
  >>>>>>   }'
Edited by Aleksander Morgado

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