From: Lukasz Nowak <lnowak(a)tycoint.com&gt; Telit AT modem firmware (tested with UE910-EUR) generates +CGREG: 0\r\n\r\n+CGEV: NW DETACH after a context is de-activated and ppp connection closed. Then, after a random amount of time (observed from a few seconds to a few hours), an unsolicited +CGREG: 1 arrives. Attempt to fix the problem, by sending AT+CGATT=1 once. This does not re-activate the context, but if a network connection is still correct, will generate an immediate +CGREG: 1. --- drivers/atmodem/gprs.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/drivers/atmodem/gprs.c b/drivers/atmodem/gprs.c index 7ea9f00..3a6364e 100644 --- a/drivers/atmodem/gprs.c +++ b/drivers/atmodem/gprs.c @@ -50,6 +50,8 @@ struct gprs_data { GAtChat *chat; unsigned int vendor; unsigned int last_auto_context_id; + gboolean telit_try_reattach; + int attached; }; static void at_cgatt_cb(gboolean ok, GAtResult *result, gpointer user_data) @@ -73,8 +75,10 @@ static void at_gprs_set_attached(struct ofono_gprs *gprs, int attached, snprintf(buf, sizeof(buf), "AT+CGATT=%i", attached ? 1 : 0); if (g_at_chat_send(gd->chat, buf, none_prefix, - at_cgatt_cb, cbd, g_free) > 0) + at_cgatt_cb, cbd, g_free) > 0) { + gd->attached = attached; return; + } g_free(cbd); @@ -194,6 +198,28 @@ static void cgreg_notify(GAtResult *result, gpointer user_data) NULL, NULL, NULL, gd->vendor) == FALSE) return; + /* + * Telit AT modem firmware (tested with UE910-EUR) generates + * +CGREG: 0\r\n\r\n+CGEV: NW DETACH + * after a context is de-activated and ppp connection closed. + * Then, after a random amount of time (observed from a few seconds + * to a few hours), an unsolicited +CGREG: 1 arrives. + * Attempt to fix the problem, by sending AT+CGATT=1 once. + * This does not re-activate the context, but if a network connection + * is still correct, will generate an immediate +CGREG: 1. + */ + if (gd->vendor == OFONO_VENDOR_TELIT) { + if (gd->attached && !status && !gd->telit_try_reattach) { + DBG("Trying to re-attach gprs network"); + gd->telit_try_reattach = TRUE; + g_at_chat_send(gd->chat, "AT+CGATT=1", none_prefix, + NULL, NULL, NULL); + return; + } + + gd->telit_try_reattach = FALSE; + } + ofono_gprs_status_notify(gprs, status); } @@ -214,6 +240,10 @@ static void cgev_notify(GAtResult *result, gpointer user_data) if (g_str_equal(event, "NW DETACH") || g_str_equal(event, "ME DETACH")) { + if (gd->vendor == OFONO_VENDOR_TELIT && + gd->telit_try_reattach) + return; + ofono_gprs_detached_notify(gprs); return; } else if (g_str_has_prefix(event, "ME PDN ACT")) { -- 2.7.4