SMS support through MBIM

[Bjørn Mork]

Bjørn Mork <bjorn at mork.no> writes:

> Bjørn Mork <bjorn at mork.no> writes:
>
>> <<<<<<   cid     = 'device-service-subscriber-list' (0x00000013)
>>
>>
>> I tried manually sending the exact same commands, but I cannot repeat
>> the problem.  The notifications are still received.  Puzzling.
>
> That was because I managed to get the 'device-service-subscriber-list'
> command wrong.  Sending the same command MM sends turns off
> notifications.  So that command is indeed the cause.


And looking closer at it, that shouldn't be a surprise at all. MM
sends/receives these 3 'device-service-subscriber-list' commands:


<<<<<<   data   = 03:00:00:00:54:00:00:00:0A:00:00:00:01:00:00:00:00:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:13:00:00:00:01:00:00:00:24:00:00:00:01:00:00:00:0C:00:00:00:18:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:01:00:00:00:0B:00:00:00
>>>>>>   data   = 03:00:00:80:54:00:00:00:0A:00:00:00:01:00:00:00:00:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:13:00:00:00:00:00:00:00:24:00:00:00:01:00:00:00:0C:00:00:00:18:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:01:00:00:00:0B:00:00:00

<<<<<<   data   = 03:00:00:00:58:00:00:00:0B:00:00:00:01:00:00:00:00:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:13:00:00:00:01:00:00:00:28:00:00:00:01:00:00:00:0C:00:00:00:1C:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:02:00:00:00:0B:00:00:00:09:00:00:00
>>>>>>   data   = 03:00:00:80:58:00:00:00:0B:00:00:00:01:00:00:00:00:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:13:00:00:00:00:00:00:00:28:00:00:00:01:00:00:00:0C:00:00:00:1C:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:02:00:00:00:0B:00:00:00:09:00:00:00

<<<<<<   data   = 03:00:00:00:58:00:00:00:0E:00:00:00:01:00:00:00:00:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:13:00:00:00:01:00:00:00:28:00:00:00:01:00:00:00:0C:00:00:00:1C:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:02:00:00:00:0B:00:00:00:09:00:00:00
>>>>>>   data   = 03:00:00:80:58:00:00:00:0E:00:00:00:01:00:00:00:00:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:13:00:00:00:00:00:00:00:28:00:00:00:01:00:00:00:0C:00:00:00:1C:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:02:00:00:00:0B:00:00:00:09:00:00:00


Which decodes to (only listing the replies, as they are identical to the
commands):

MBIM_MESSAGE_HEADER
  MessageType:  0x80000003 (MBIM_COMMAND_DONE)
  MessageLength:        84
  TransactionId:        10
MBIM_FRAGMENT_HEADER
  TotalFragments:       0x00000001
  CurrentFragment:      0x00000000
BASIC_CONNECT (a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
MBIM_CID_DEVICE_SERVICE_SUBSCRIBE_LIST (19)
MBIM_STATUS_SUCCESS (0)
InformationBuffer [36]:
  ElementCount (EC): 1
  DeviceServiceSubscribeRefList:
  BASIC_CONNECT (a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
    CidCount:   1
    CidList:    11
      MBIM_CID_SIGNAL_STATE


MBIM_MESSAGE_HEADER
  MessageType:  0x80000003 (MBIM_COMMAND_DONE)
  MessageLength:        88
  TransactionId:        11
MBIM_FRAGMENT_HEADER
  TotalFragments:       0x00000001
  CurrentFragment:      0x00000000
BASIC_CONNECT (a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
MBIM_CID_DEVICE_SERVICE_SUBSCRIBE_LIST (19)
MBIM_STATUS_SUCCESS (0)
InformationBuffer [40]:
  ElementCount (EC): 1
  DeviceServiceSubscribeRefList:
  BASIC_CONNECT (a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
    CidCount:   2
    CidList:    11, 9
      MBIM_CID_SIGNAL_STATE
      MBIM_CID_REGISTER_STATE


MBIM_MESSAGE_HEADER
  MessageType:  0x80000003 (MBIM_COMMAND_DONE)
  MessageLength:        88
  TransactionId:        14
MBIM_FRAGMENT_HEADER
  TotalFragments:       0x00000001
  CurrentFragment:      0x00000000
BASIC_CONNECT (a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
MBIM_CID_DEVICE_SERVICE_SUBSCRIBE_LIST (19)
MBIM_STATUS_SUCCESS (0)
InformationBuffer [40]:
  ElementCount (EC): 1
  DeviceServiceSubscribeRefList:
  BASIC_CONNECT (a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
    CidCount:   2
    CidList:    11, 9
      MBIM_CID_SIGNAL_STATE
      MBIM_CID_REGISTER_STATE


Only the BASIC_CONNECT service is enabled, so all SMS notifications are
disabled.



Bjørn