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<p>Hello,<br>
</p>
<p><br>
</p>
<p>Having an odd issue where ModemManager has trouble reading SIM PIN status from Sierra MC7750 (Verizon US, LTE+CDMA, QMI interface) modules after a modem reset.<br>
</p>
<p><br>
</p>
<p>At first system boot, MM has no issue detecting the modem and activating a connection. These are in mobile devices, so it's common to lose signal and later need to reconnect when back in a coverage area. These modems can be a little cranky, and sometimes
at this point won't build a data connection after repeated attempts (known Qualcomm-level issue according to Sierra), so we have a separate process that watches for that and issues a Reset() via the MM DBus interface. Reset() on these does a "full power cycle",
as if the modem was unplugged from USB and plugged back in. <br>
</p>
<p><br>
</p>
<p>When the device turns back on, during detection NM says it doesn't have a SIM object:<br>
</p>
<blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;">
<div>NetworkManager[6651]: <info> [1539101206.9778] modem-broadband[cdc-wdm1]: failed to retrieve SIM object: No SIM object available<br>
</div>
</blockquote>
<div><br>
MM reports this:<br>
</div>
<blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;">
<div>
<div>ModemManager[8643]: <warn> Couldn't load unlock retries: 'Couldn't get unlock retries: QMI protocol error (3): 'Internal''<br>
</div>
</div>
<div>
<div>ModemManager[8643]: <warn> couldn't load list of Own Numbers: 'Couldn't get MSISDN: QMI protocol error (25): 'DeviceUnsupported''<br>
</div>
</div>
</blockquote>
<div>
<div><br>
Looking into MM debug logs, it's failing the "UIM Get PIN Status" step<span style="font-size: 12pt;">, the first time for IncorrectPin, then Internal QMI error for the rest of the retries. The SIMs don't have a PIN we're aware of.</span></div>
</div>
<div><span style="font-size: 12pt;"><br>
</span></div>
<blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;">
<div><debug> [1539101547.534249] [mm-iface-modem.c:3902] load_current_capabilities_ready(): Setting EPS network as supported</div>
<div><debug> [1539101547.538395] [mm-iface-modem.c:3928] load_current_capabilities_ready(): Checking if multimode device has a SIM...</div>
<div><debug> [1539101547.542528] [mm-broadband-modem-qmi.c:1845] load_unlock_required_context_step(): loading unlock required (DMS)...</div>
<div>[/dev/cdc-wdm1] sent message...</div>
<div><<<<<< RAW:</div>
<div><<<<<< length = 13<br>
</div>
<div><<<<<< data = 01:0C:00:00:02:01:00:02:00:2B:00:00:00<br>
</div>
<div>[/dev/cdc-wdm1] sent generic request (translated)...<br>
</div>
<div><<<<<< QMUX:<br>
</div>
<div><<<<<< length = 12</div>
<div><<<<<< flags = 0x00</div>
<div><<<<<< service = "dms"</div>
<div><<<<<< client = 1</div>
<div><<<<<< QMI:</div>
<div><<<<<< flags = "none"</div>
<div><<<<<< transaction = 2</div>
<div><<<<<< tlv_length = 0</div>
<div><<<<<< message = "UIM Get PIN Status" (0x002B)</div>
<div>[/dev/cdc-wdm1] received message...</div>
<div><<<<<< RAW:</div>
<div><<<<<< length = 20</div>
<div><<<<<< data = 01:13:00:80:02:01:02:02:00:2B:00:07:00:02:04:00:01:00:0C:00</div>
<div>[/dev/cdc-wdm1] received generic response (translated)...</div>
<div><<<<<< QMUX:</div>
<div><<<<<< length = 19</div>
<div><<<<<< flags = 0x80</div>
<div><<<<<< service = "dms"</div>
<div><<<<<< client = 1</div>
<div><<<<<< QMI:</div>
<div><<<<<< flags = "response"</div>
<div><<<<<< transaction = 2</div>
<div><<<<<< tlv_length = 7</div>
<div><<<<<< message = "UIM Get PIN Status" (0x002B)</div>
<div><<<<<< TLV:</div>
<div><<<<<< type = "Result" (0x02)</div>
<div><<<<<< length = 4</div>
<div><<<<<< value = 01:00:0C:00</div>
<div><<<<<< translated = FAILURE: IncorrectPin</div>
<div><debug> [1539101547.550223] [mm-iface-modem.c:268] load_unlock_required_ready(): Couldn't check if unlock required: 'Couldn't get PIN status: QMI protocol error (12): 'IncorrectPin''<br>
</div>
</blockquote>
<span style="font-size: 12pt;"></span>
<div><span style="font-size: 12pt;"></span>(removed retries 1-5 here, they're identical)<br>
<blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;">
<div>
<div><br>
</div>
<div><debug> [1539101558.280189] [mm-iface-modem.c:292] load_unlock_required_ready(): Retrying (6) unlock required check</div>
</div>
<div>
<div><debug> [1539101560.270256] [mm-broadband-modem-qmi.c:1845] load_unlock_required_context_step(): loading unlock required (DMS)...</div>
</div>
<div>
<div>[/dev/cdc-wdm1] sent message...</div>
</div>
<div>
<div><<<<<< RAW:</div>
</div>
<div>
<div><<<<<< length = 13</div>
</div>
<div>
<div><<<<<< data = 01:0C:00:00:02:01:00:08:00:2B:00:00:00</div>
</div>
<div>
<div>[/dev/cdc-wdm1] sent generic request (translated)...</div>
</div>
<div>
<div><<<<<< QMUX:</div>
</div>
<div>
<div><<<<<< length = 12</div>
</div>
<div>
<div><<<<<< flags = 0x00<br>
</div>
</div>
<div>
<div><<<<<< service = "dms"</div>
</div>
<div>
<div><<<<<< client = 1</div>
</div>
<div>
<div><<<<<< QMI:</div>
</div>
<div>
<div><<<<<< flags = "none"</div>
</div>
<div>
<div><<<<<< transaction = 8</div>
</div>
<div>
<div><<<<<< tlv_length = 0</div>
</div>
<div>
<div><<<<<< message = "UIM Get PIN Status" (0x002B)</div>
</div>
<div>
<div>[/dev/cdc-wdm1] received message...</div>
</div>
<div>
<div><<<<<< RAW:</div>
</div>
<div>
<div><<<<<< length = 20</div>
</div>
<div>
<div><<<<<< data = 01:13:00:80:02:01:02:08:00:2B:00:07:00:02:04:00:01:00:03:00</div>
</div>
<div>
<div>[/dev/cdc-wdm1] received generic response (translated)...</div>
</div>
<div>
<div><<<<<< QMUX:</div>
</div>
<div>
<div><<<<<< length = 19</div>
</div>
<div>
<div><<<<<< flags = 0x80</div>
</div>
<div>
<div><<<<<< service = "dms"</div>
</div>
<div>
<div><<<<<< client = 1</div>
</div>
<div>
<div><<<<<< QMI:</div>
</div>
<div>
<div><<<<<< flags = "response"</div>
</div>
<div>
<div><<<<<< transaction = 8</div>
</div>
<div>
<div><<<<<< tlv_length = 7</div>
</div>
<div>
<div><<<<<< message = "UIM Get PIN Status" (0x002B)</div>
</div>
<div>
<div><<<<<< TLV:</div>
</div>
<div>
<div><<<<<< type = "Result" (0x02)<br>
</div>
</div>
<div>
<div><<<<<< length = 4</div>
</div>
<div>
<div><<<<<< value = 01:00:03:00</div>
</div>
<div>
<div><<<<<< translated = FAILURE: Internal</div>
</div>
<div>
<div><debug> [1539101560.278384] [mm-iface-modem.c:268] load_unlock_required_ready(): Couldn't check if unlock required: 'Couldn't get PIN status (retry): QMI protocol error (3): 'Internal''</div>
</div>
<div>
<div><debug> [1539101560.282222] [mm-iface-modem.c:3864] current_capabilities_internal_load_unlock_required_ready(): Multimode device without SIM, no 3GPP capabilities</div>
</div>
</blockquote>
<div><br>
<br>
</div>
<p>Running (what I think is) the equivalent status command via qmicli directly, it looks like it works:<br>
</p>
<blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;">
<div>[root@hostname ~]# qmicli -p -d /dev/cdc-wdm1 --dms-uim-get-pin-status<br>
</div>
<div>[/dev/cdc-wdm1] PIN status retrieved successfully</div>
<div>[/dev/cdc-wdm1] PIN1:</div>
<div> Status: disabled</div>
<div> Verify: 3<br>
</div>
<div> Unblock: 10<br>
</div>
<div>[/dev/cdc-wdm1] PIN2:<br>
</div>
<div> Status: enabled-not-verified<br>
</div>
<div> Verify: 3<br>
</div>
<div> Unblock: 10</div>
</blockquote>
<p><br>
</p>
<p><span style="font-size: 12pt;">Here's the odd part - t<span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">his only happens if the modem is reset while MM is running.</span> </span><span style="font-size: 12pt;">If
I </span><span style="font-size: 12pt;">do a 'systemctl restart ModemManager' at this point, the modem+SIM are detected right away, and all is well. That's my workaround right now, but I'd rather not be restarting services if I can </span><span style="font-size: 12pt;">help
it: we have 2 modules in the system (second one is either a MC7700 or MC7354) and</span><span style="font-size: 12pt;"> restarting MM</span><span style="font-size: 12pt;"> disrupts the other data session. No detection issues from either one of those models.</span><br>
</p>
<p><span style="font-size: 12pt;"><br>
</span></p>
<p>We're using the RHEL7 delivered MM build, 1.6.10, with libqmi 1.18.0. Both appear unmodified according to the RPM specfile, no odd patches, etc. <br>
</p>
<p><span style="font-size: 12pt;"><br>
</span></p>
<p><span style="font-size: 12pt;">Any ideas where to look next? Thanks in advance!</span></p>
<p><br>
</p>
<p>-- Brendan Bowden<br>
</p>
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