[MM PATCH 2/2] novatel-lte: retry $NWQMISTATUS upon an unknown error during connecting

[Ben Chan <benchan chromium org>]

The $NWQMISTATUS command sometimes replies an ERROR shortly after
calling the $NWQMICONNECT command, but then replies the proper QMI
status if we retry it. This behavior is observed on an E362 modem with
4.08 firmware.

    (ttyUSB0): --> 'AT$NWQMICONNECT=,,,,,,"",,,"",""<CR>'
    (ttyUSB0): <-- '<CR><LF>OK<CR><LF>'
    (ttyUSB0): --> 'AT$NWQMISTATUS<CR>'
    (ttyUSB0): <-- '<CR><LF>ERROR<CR><LF>'
    Got failure code 100: Unknown error
    QMI connection status failed: Unknown error
---
 plugins/novatel/mm-broadband-bearer-novatel-lte.c |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/plugins/novatel/mm-broadband-bearer-novatel-lte.c b/plugins/novatel/mm-broadband-bearer-novatel-lte.c
index e570024..e1944bb 100644
--- a/plugins/novatel/mm-broadband-bearer-novatel-lte.c
+++ b/plugins/novatel/mm-broadband-bearer-novatel-lte.c
@@ -191,12 +191,14 @@ connect_3gpp_qmistatus_ready (MMBaseModem *modem,
                                               &error);
     if (!result) {
         mm_warn ("QMI connection status failed: %s", error->message);
-        g_simple_async_result_take_error (ctx->result, error);
-        detailed_connect_context_complete_and_free (ctx);
-        return;
-    }
-
-    if (is_qmistatus_connected (result)) {
+        if (!g_error_matches (error, MM_MOBILE_EQUIPMENT_ERROR, MM_MOBILE_EQUIPMENT_ERROR_UNKNOWN)) {
+            g_simple_async_result_take_error (ctx->result, error);
+            detailed_connect_context_complete_and_free (ctx);
+            return;
+        }
+        g_error_free (error);
+        result = "Unknown error";
+    } else if (is_qmistatus_connected (result)) {
         MMBearerIpConfig *config;
 
         mm_dbg("Connected");
-- 
1.7.7.3