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 | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/atmodem/gprs.c b/drivers/atmodem/gprs.c index 7ea9f00..ba8646c 100644 --- a/drivers/atmodem/gprs.c +++ b/drivers/atmodem/gprs.c @@ -50,6 +50,7 @@ struct gprs_data { GAtChat *chat; unsigned int vendor; unsigned int last_auto_context_id; + gboolean network_detach_retry; }; static void at_cgatt_cb(gboolean ok, GAtResult *result, gpointer user_data) @@ -194,6 +195,28 @@ static void cgreg_notify(GAtResult *result, gpointer user_data) NULL, NULL, NULL, gd->vendor) == FALSE) return; + DBG("status=%d vendor=%d retry=%d", status, gd->vendor, gd->network_detach_retry); + + /* + * 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 && + !status && !gd->network_detach_retry) { + DBG("Trying to re-attach gprs network"); + gd->network_detach_retry = TRUE; + g_at_chat_send(gd->chat, "AT+CGATT=1", none_prefix, + NULL, NULL, NULL); + return; + } + gd->network_detach_retry = FALSE; + ofono_gprs_status_notify(gprs, status); } @@ -214,6 +237,10 @@ 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->network_detach_retry) + return; ofono_gprs_detached_notify(gprs); return; } else if (g_str_has_prefix(event, "ME PDN ACT")) { -- 2.7.4