Hi,

I've observed this issue in MM 1.18.6. If I create and send SMS from 
ModemManager and then delete the message, ModemManager reports message 
successfully deleted but actually no QMI command is sent to the modem to delete 
the message. As a result, if I restart ModemManager, then that "deleted" SMS is 
again listed in ModemManager. If I try to delete it now then delete is 
successful. Sorry for confusing statement :).

Please refer to below steps along with the logs for what I'm trying to explain.

Please advise what is going wrong

# mmcli -m 0
  ----------------------------------
  General  |                   path: /org/freedesktop/ModemManager1/Modem/0
           |              device id: c6ffa92f0ce17a12c39b4a5e5c8e53f67bac2be2
  ----------------------------------
  Hardware |           manufacturer: Sierra Wireless, Incorporated
           |                  model: Sierra Wireless EM7565 Qualcomm(r) 
Snapdragon(tm) X16 LTE-A
           |      firmware revision: SWI9X50C_01.08.04.00
           |         carrier config: default
           |           h/w revision: EM7565
           |              supported: gsm-umts, lte
           |                current: gsm-umts, lte
           |           equipment id: 353533100762262
  ----------------------------------
  System   |                 device: 
/sys/devices/platform/soc/soc:internal-regs/f10f0000.usb3/usb2/2-1
           |                drivers: qcserial, cdc_mbim
           |                 plugin: sierra
           |           primary port: cdc-wdm0
           |                  ports: cdc-wdm0 (mbim), ttyUSB0 (qcdm), ttyUSB1 
(gps),
           |                         ttyUSB2 (at), wwan0 (net)
  ----------------------------------
  Status   |         unlock retries: sim-pin2 (3)
           |                  state: connected
           |            power state: on
           |            access tech: lte
           |         signal quality: 19% (recent)
  ----------------------------------
  Modes    |              supported: allowed: 3g; preferred: none
           |                         allowed: 4g; preferred: none
           |                         allowed: 3g, 4g; preferred: 4g
           |                         allowed: 3g, 4g; preferred: 3g
           |                current: allowed: 4g; preferred: none
  ----------------------------------
  Bands    |              supported: utran-1, utran-4, utran-6, utran-5, 
utran-8, utran-9,
           |                         utran-2, eutran-1, eutran-2, eutran-3, 
eutran-4, eutran-5, eutran-7,
           |                         eutran-8, eutran-9, eutran-12, eutran-13, 
eutran-18, eutran-19,
           |                         eutran-20, eutran-26, eutran-28, 
eutran-29, eutran-30, eutran-32,
           |                         eutran-41, eutran-42, eutran-43, 
eutran-46, eutran-48, eutran-66,
           |                         utran-19
           |                current: eutran-1, eutran-2, eutran-3, eutran-4, 
eutran-5, eutran-7,
           |                         eutran-8, eutran-9, eutran-12, eutran-13, 
eutran-18, eutran-19,
           |                         eutran-20, eutran-26, eutran-28, 
eutran-29, eutran-30, eutran-32,
           |                         eutran-41, eutran-42, eutran-43, 
eutran-46, eutran-48, eutran-66
  ----------------------------------
  IP       |              supported: ipv4, ipv6, ipv4v6
  ----------------------------------
  3GPP     |                   imei: 353533100762262
           |          enabled locks: fixed-dialing
           |            operator id: 40445
           |          operator name: airtel
           |           registration: home
  ----------------------------------
  3GPP EPS |   ue mode of operation: csps-2
           |    initial bearer path: /org/freedesktop/ModemManager1/Bearer/0
           |     initial bearer apn: internet
           | initial bearer ip type: ipv4
  ----------------------------------
  SIM      |       primary sim path: /org/freedesktop/ModemManager1/SIM/0
           |         sim slot paths: slot 1: 
/org/freedesktop/ModemManager1/SIM/0 (active)
           |                         slot 2: none
  ----------------------------------
  Bearer   |                  paths: /org/freedesktop/ModemManager1/Bearer/1


# mmcli -m 0 --messaging-create-sms="text='Hi',number='+919886559096'"
Successfully created new SMS: /org/freedesktop/ModemManager1/SMS/0

# mmcli -s 0 --send
successfully sent the SMS

debug 2022-05-04T06:39:16+00:00 : [/dev/cdc-wdm0] Sent message...
<<<<<< RAW:
<<<<<<   length = 76
<<<<<<   data   = 
03:00:00:00:4C:00:00:00:2B:00:00:00:01:00:00:00:00:00:00:00:53:3F:BE:EB:14:FE:44:67:9F:90:33:A2:23:E5:6C:3F:03:00:00:00:01:00:00:00:1C:00:00:00:00:00:00:00:08:00:00:00:10:00:00:00:00:01:00:0C:91:19:89:68:55:09:69:00:00:02:C8:34
debug 2022-05-04T06:39:16+00:00 : [/dev/cdc-wdm0] Sent message (translated)...
<<<<<< Header:
<<<<<<   length      = 76
<<<<<<   type        = command (0x00000003)
<<<<<<   transaction = 43
<<<<<< Fragment header:
<<<<<<   total   = 1
<<<<<<   current = 0
<<<<<< Contents:
<<<<<<   service = 'sms' (533fbeeb-14fe-4467-9f90-33a223e56c3f)
<<<<<<   cid     = 'send' (0x00000003)
<<<<<<   type    = 'set' (0x00000001)
<<<<<< Fields:
<<<<<<   Format = '0'
<<<<<<   PduMessage = {
<<<<<<       PduData = '00:01:00:0c:91:19:89:68:55:09:69:00:00:02:c8:34'
<<<<<<   }

>>>>>> RAW:
>>>>>>   length = 52
>>>>>>   data   = 
>>>>>> 03:00:00:80:34:00:00:00:2B:00:00:00:01:00:00:00:00:00:00:00:53:3F:BE:EB:14:FE:44:67:9F:90:33:A2:23:E5:6C:3F:03:00:00:00:00:00:00:00:04:00:00:00:A8:00:00:00
debug 2022-05-04T06:39:16+00:00 : [/dev/cdc-wdm0] Received message 
(translated)...
>>>>>> Header:
>>>>>>   length      = 52
>>>>>>   type        = command-done (0x80000003)
>>>>>>   transaction = 43
>>>>>> Fragment header:
>>>>>>   total   = 1
>>>>>>   current = 0
>>>>>> Contents:
>>>>>>   status error = 'None' (0x00000000)
>>>>>>   service      = 'sms' (533fbeeb-14fe-4467-9f90-33a223e56c3f)
>>>>>>   cid          = 'send' (0x00000003)
>>>>>> Fields:
>>>>>>   MessageReference = '168'

# mmcli -m 0 --messaging-list-sms
    /org/freedesktop/ModemManager1/SMS/0 (sent)

# mmcli -m 0 --messaging-delete-sms=0
successfully deleted SMS from modem

< NO QMI MESSAGES ARE PRINTED HERE>

# mmcli -m 0 --messaging-list-sms
No sms messages were found

RESTART MODEMMANAGER

# /etc/init.d/modemmanager restart

# mmcli -m 0 --messaging-list-sms
    /org/freedesktop/ModemManager1/SMS/0 (sent)  < - - This message was deleted 
above and it got reappeared

# mmcli -m 0 --messaging-delete-sms=0
successfully deleted SMS from modem

NOW THE MESSAGE GOT DELETED:

debug 2022-05-04T06:41:23+00:00 : [/dev/cdc-wdm0] Sent message...
<<<<<< RAW:
<<<<<<   length = 56
<<<<<<   data   = 
03:00:00:00:38:00:00:00:2A:00:00:00:01:00:00:00:00:00:00:00:53:3F:BE:EB:14:FE:44:67:9F:90:33:A2:23:E5:6C:3F:04:00:00:00:01:00:00:00:08:00:00:00:01:00:00:00:01:00:00:00
debug 2022-05-04T06:41:23+00:00 : [/dev/cdc-wdm0] Sent message (translated)...
<<<<<< Header:
<<<<<<   length      = 56
<<<<<<   type        = command (0x00000003)
<<<<<<   transaction = 42
<<<<<< Fragment header:
<<<<<<   total   = 1
<<<<<<   current = 0
<<<<<< Contents:
<<<<<<   service = 'sms' (533fbeeb-14fe-4467-9f90-33a223e56c3f)
<<<<<<   cid     = 'delete' (0x00000004)
<<<<<<   type    = 'set' (0x00000001)
<<<<<< Fields:
<<<<<<   Flag = 'index'
<<<<<<   MessageIndex = '1'
debug 2022-05-04T06:41:23+00:00 : [/dev/cdc-wdm0] Received message...
>>>>>> RAW:
>>>>>>   length = 48
>>>>>>   data   = 
>>>>>> 03:00:00:80:30:00:00:00:2A:00:00:00:01:00:00:00:00:00:00:00:53:3F:BE:EB:14:FE:44:67:9F:90:33:A2:23:E5:6C:3F:04:00:00:00:00:00:00:00:00:00:00:00
debug 2022-05-04T06:41:23+00:00 : [/dev/cdc-wdm0] Received message 
(translated)...
>>>>>> Header:
>>>>>>   length      = 48
>>>>>>   type        = command-done (0x80000003)
>>>>>>   transaction = 42
>>>>>> Fragment header:
>>>>>>   total   = 1
>>>>>>   current = 0
>>>>>> Contents:
>>>>>>   status error = 'None' (0x00000000)
>>>>>>   service      = 'sms' (533fbeeb-14fe-4467-9f90-33a223e56c3f)
>>>>>>   cid          = 'delete' (0x00000004)
debug 2022-05-04T06:41:23+00:00 : [/dev/cdc-wdm0] Received message...
>>>>>> RAW:
>>>>>>   length = 52
>>>>>>   data   = 
>>>>>> 07:00:00:80:34:00:00:00:00:00:00:00:01:00:00:00:00:00:00:00:53:3F:BE:EB:14:FE:44:67:9F:90:33:A2:23:E5:6C:3F:05:00:00:00:08:00:00:00:00:00:00:00:00:00:00:00
debug 2022-05-04T06:41:23+00:00 : [/dev/cdc-wdm0] Received message 
(translated)...
>>>>>> Header:
>>>>>>   length      = 52
>>>>>>   type        = indicate-status (0x80000007)
>>>>>>   transaction = 0
>>>>>> Fragment header:
>>>>>>   total   = 1
>>>>>>   current = 0
>>>>>> Contents:
>>>>>>   service = 'sms' (533fbeeb-14fe-4467-9f90-33a223e56c3f)
>>>>>>   cid     = 'message-store-status' (0x00000005)
>>>>>> Fields:
>>>>>>   Flag = 'none'
>>>>>>   MessageIndex = '0'

# mmcli -m 0 --messaging-list-sms
No sms messages were found

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