<div dir="ltr"><div>Hi Aleksander,</div><div><br></div><div>Thanks for the reply! This problem was discovered when using a MC7455 actually, however I am using a SIMCOM modem at the moment, it exhibits the same behaviour. I have tried the same operations as you but still have the problem. However the strange thing is if I use --verbose I get expected behaviour (most of the time - it seems to consistently work now but I have seen it exhibit the behaviour I reported before). I also recompiled the code and noticed that when inspecting the binary for the preference variable being passed, the LTE and td-scdma bits are always set high. This testing was done without the --verbose flag. I will test with that when I can.</div><div><br></div><div>For example, when I run the command qmicli -d /dev/cdc-wdm0 --nas-set-system-selection-preference="umts" here is the binary of the passed preference variable, with LTE and tc-scdma bits set high for some reason (indicated with -): 1011011101111110010-11-0000. Now this is OR'd and the umts bit is set high as expected: 101101110111111001011-1-000.</div><div><br></div><div>I have created a simple patch to set the bits to 0 before the OR'ing loop occurs and this solves my problem and will do until it can be fixed in a better way. </div><div><br></div><div><br></div><div>--- libqmi-1.16.2/src/qmicli/qmicli-helpers.c<span class="gmail-Apple-tab-span" style="white-space:pre"> </span>2017-02-15 13:01:37.188665609 +0000</div><div>+++ libqmi-mod/src/qmicli/qmicli-helpers.c<span class="gmail-Apple-tab-span" style="white-space:pre"> </span>2017-02-15 14:34:45.204579991 +0000</div><div>@@ -188,6 +188,11 @@</div><div> type = qmi_nas_rat_mode_preference_get_type ();</div><div> flags_class = G_FLAGS_CLASS (g_type_class_ref (type));</div><div> </div><div>+ /* Mask technology preference bits to 0, some can be set high in err, reset them.</div><div>+ * See QmiNasRatModePreference Enum for reference </div><div>+ *</div><div>+ *out &= 0xFFFFFFC0;</div><div>+</div><div> items = g_strsplit_set (str, "|", 0);</div><div> for (iter = items; iter && *iter && success; iter++) {</div><div> if (!*iter[0])</div><div><br></div><div><br></div><div>Here is the same process you went through, you can see the problems with mine:</div><div>(set LTE as preferred)</div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --nas-get-system-selection-preference</div><div>[/dev/cdc-wdm0] Successfully got system selection preference</div><div>Emergency mode: 'no'</div><div>Mode preference: 'umts, lte, td-scdma'</div><div>Band preference: 'gsm-dcs-1800, gsm-900-extended, wcdma-2100, wcdma-900'</div><div>LTE band preference: '1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 24, 25, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43'</div><div>TD-SCDMA band preference: 'a, b, c, d, e, f'</div><div>Roaming preference: 'any'</div><div>Network selection preference: 'automatic'</div><div>Service domain preference: 'cs-ps'</div><div>Service selection preference: 'automatic'</div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --nas-get-technology-preference</div><div>[/dev/cdc-wdm0] Successfully got technology preference</div><div>Active: '3gpp, cdma-or-wcdma, lte', duration: 'permanent'</div><div><br></div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --nas-set-system-selection-preference="lte"</div><div>[/dev/cdc-wdm0] System selection preference set successfully; replug your device.</div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode=offline</div><div>[/dev/cdc-wdm0] Operating mode set successfully</div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode=reset</div><div>[/dev/cdc-wdm0] Operating mode set successfully</div><div><br></div><div>(reboots)</div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --nas-get-system-selection-preference</div><div>Successfully got system selection preference</div><div>Emergency mode: 'no'</div><div>Mode preference: 'lte, td-scdma'</div><div>Band preference: 'gsm-dcs-1800, gsm-900-extended, wcdma-2100, wcdma-900'</div><div>LTE band preference: '1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 24, 25, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43'</div><div>TD-SCDMA band preference: 'a, b, c, d, e, f'</div><div>Roaming preference: 'any'</div><div>Network selection preference: 'automatic'</div><div>Service domain preference: 'cs-ps'</div><div>Service selection preference: 'automatic'</div><div><br></div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --nas-get-technology-preference</div><div>[/dev/cdc-wdm0] Successfully got technology preference</div><div>Active: '3gpp, lte', duration: 'permanent'</div><div><br></div><div>(set umts as preferred)</div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --nas-set-system-selection-preference="umts"</div><div><br></div><div>At this stage I got an error message - error: couldn't set operating mode: QMI protocol error (3): 'Internal'</div><div><br></div><div>Only read commands seemed to work correctly then, setting mode to offline gave error:</div><div>qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode=offline</div><div>error: couldn't set operating mode: QMI protocol error (60): 'InvalidTransaction'</div><div><br></div><div>"Reset" said it worked but the modem did not appear to reset. I completed a power cycle. Everything worked again. System was still set to LTE settings.</div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --nas-set-system-selection-preference="umts"</div><div>[/dev/cdc-wdm0] System selection preference set successfully; replug your device.</div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode=offline</div><div>[/dev/cdc-wdm0] Operating mode set successfully</div><div><br></div><div>sudo qmicli -d /dev/cdc-wdm4 --dms-set-operating-mode=reset</div><div>[/dev/cdc-wdm0] Operating mode set successfully</div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --nas-get-system-selection-preference </div><div><br></div><div>[/dev/cdc-wdm0] Successfully got system selection preference</div><div>Emergency mode: 'no'</div><div>Mode preference: 'umts, lte, td-scdma'</div><div>Band preference: 'gsm-dcs-1800, gsm-900-extended, wcdma-2100, wcdma-900'</div><div>LTE band preference: '1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 24, 25, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43'</div><div>TD-SCDMA band preference: 'a, b, c, d, e, f'</div><div>Roaming preference: 'any'</div><div>Network selection preference: 'automatic'</div><div>Service domain preference: 'cs-ps'</div><div>Service selection preference: 'automatic'</div><div><br></div><div>qmicli -d /dev/cdc-wdm0 --nas-get-technology-preference</div><div>[/dev/cdc-wdm0] Successfully got technology preference</div><div>Active: '3gpp, cdma-or-wcdma, lte', duration: 'permanent'</div><div><br></div><div><br></div><div><br></div><div>Thanks for the help, I will do further testing on this.</div><div><br></div><div>--</div><div>Paul</div><div><br></div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 15 February 2017 at 14:33, Aleksander Morgado <span dir="ltr"><<a href="mailto:aleksander@aleksander.es" target="_blank">aleksander@aleksander.es</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hey Paul,<br> <span class=""><br> On Tue, Feb 14, 2017 at 3:26 PM, Paul Gildea <<a href="mailto:gildeap@tcd.ie">gildeap@tcd.ie</a>> wrote:<br> > I am trying to set the device to use a certain technology only, example UMTS<br> > or LTE. However when I do so there are still other options available.<br> ><br> > Example: qmicli -d /dev/cdc-wdm0 --nas-set-system-selection-<wbr>preference=umts<br> > and rebooting will give a mode list of umts, lte, td-scdma via qmicli -d<br> > /dev/cdc-wdm0 --nas-get-technology-<wbr>preference instead of just UMTS.<br> ><br> > If I then set it to LTE I will get "lte, td-scdma" instead of just LTE. Is<br> > there something I am missing? I will check the code further to try and solve<br> > this.<br> <br> </span>Would be good to get debug logs of all commands you use (run them with<br> --verbose), just to make sure the messages sent/received are the<br> expected ones.<br> <br> Note that technology preference (TP) and system selection preference<br> (SSP) are two ways of trying to get the same result. In ModemManager<br> we use SSP when available, and TP otherwise. Also note that there is a<br> "NAS Set Technology Preference" command in QMI, we just didn't<br> implement a --nas-set-technology-<wbr>preference.<br> <br> For reference, this is what I'm getting when setting preference to<br> umts vs LTE in a MC7455:<br> <br> (set LTE as preferred)<br> <br> $ sudo qmicli -d /dev/cdc-wdm4 --nas-get-system-selection-<wbr>preference<br> Emergency mode: 'no'<br> Mode preference: 'umts, lte'<br> Band preference: 'wcdma-2100, wcdma-pcs-1900, wcdma-dcs-1800,<br> wcdma-1700-us, wcdma-850-us, wcdma-900'<br> LTE band preference: '1, 2, 3, 4, 5, 7, 8, 12, 13, 20, 25, 41'<br> TD-SCDMA band preference: '(null)'<br> Roaming preference: 'any'<br> Network selection preference: 'automatic'<br> Service domain preference: 'cs-ps'<br> Service selection preference: 'automatic'<br> <br> $ sudo qmicli -d /dev/cdc-wdm4 --nas-get-technology-<wbr>preference<br> Active: 'auto', duration: 'permanent'<br> <br> $ sudo qmicli -d /dev/cdc-wdm4 --nas-set-system-selection-<wbr>preference="lte"<br> $ sudo qmicli -d /dev/cdc-wdm4 --dms-set-operating-mode=<wbr>offline<br> $ sudo qmicli -d /dev/cdc-wdm4 --dms-set-operating-mode=reset<br> <br> (reboots)<br> <br> $ sudo qmicli -d /dev/cdc-wdm4 --nas-get-system-selection-<wbr>preference<br> Emergency mode: 'no'<br> Mode preference: 'lte'<br> Band preference: 'wcdma-2100, wcdma-pcs-1900, wcdma-dcs-1800,<br> wcdma-1700-us, wcdma-850-us, wcdma-900'<br> LTE band preference: '1, 2, 3, 4, 5, 7, 8, 12, 13, 20, 25, 41'<br> TD-SCDMA band preference: '(null)'<br> Roaming preference: 'any'<br> Network selection preference: 'automatic'<br> Service domain preference: 'cs-ps'<br> Service selection preference: 'automatic'<br> <br> $ sudo qmicli -d /dev/cdc-wdm4 --nas-get-technology-<wbr>preference<br> Active: '3gpp, lte', duration: 'permanent'<br> <br> <br> (set umts as preferred)<br> <br> $ sudo qmicli -d /dev/cdc-wdm4 --nas-set-system-selection-<wbr>preference="umts"<br> $ sudo qmicli -d /dev/cdc-wdm4 --dms-set-operating-mode=<wbr>offline<br> $ sudo qmicli -d /dev/cdc-wdm4 --dms-set-operating-mode=reset<br> <br> $ sudo qmicli -d /dev/cdc-wdm4 --nas-get-system-selection-<wbr>preference<br> Emergency mode: 'no'<br> Mode preference: 'umts'<br> Band preference: 'wcdma-2100, wcdma-pcs-1900, wcdma-dcs-1800,<br> wcdma-1700-us, wcdma-850-us, wcdma-900'<br> LTE band preference: '1, 2, 3, 4, 5, 7, 8, 12, 13, 20, 25, 41'<br> TD-SCDMA band preference: '(null)'<br> Roaming preference: 'any'<br> Network selection preference: 'automatic'<br> Service domain preference: 'cs-ps'<br> Service selection preference: 'automatic'<br> <br> $ sudo qmicli -d /dev/cdc-wdm4 --nas-get-technology-<wbr>preference<br> Active: '3gpp, cdma-or-wcdma', duration: 'permanent'<br> <span class="HOEnZb"><font color="#888888"><br> --<br> Aleksander<br> <a href="https://aleksander.es" rel="noreferrer" target="_blank">https://aleksander.es</a><br> </font></span></blockquote></div><br></div>