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drivers: modem: gsm_ppp: hold off ppp until we're attached to nw

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Attempting to initialize PPP without first ensuring we're attached to
the network packet service will sometimes lead to "NO CARRIER" errors
when we initialize PPP with the modem. This has been observed
reproducibly on some SIMCOM7600E modems.

This commit holds off on PPP initialization until modem has reported
that it is indeed attached by using the "AT+CGATT?" command (see 3GPP TS
27.007)

Signed-off-by: Benjamin Lindqvist <benjamin.lindqvist@endian.se>
This commit is contained in:
Benjamin Lindqvist 2020-10-16 09:47:11 +02:00 • committed by Jukka Rissanen
commit 598adb8830
1 changed files with 35 additions and 0 deletions
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35
drivers/modem/gsm_ppp.c
View file

@ -7,6 +7,7 @@
#include <logging/log.h>
LOG_MODULE_REGISTER(modem_gsm, CONFIG_MODEM_LOG_LEVEL);
#include <stdlib.h>
#include <kernel.h>
#include <device.h>
#include <sys/ring_buffer.h>
@ -255,6 +256,25 @@ static struct setup_cmd setup_cmds[] = {
SETUP_CMD_NOHANDLE("AT+CGDCONT=1,\"IP\",\"" CONFIG_MODEM_GSM_APN "\""),
};
MODEM_CMD_DEFINE(on_cmd_atcmdinfo_attached)
{
int error = -EAGAIN;
/* Expected response is "+CGATT: 0|1" so simply look for '1' */
if (argc && atoi(argv[0]) == 1) {
error = 0;
LOG_INF("Attached to packet service!");
}
modem_cmd_handler_set_error(data, error);
k_sem_give(&gsm.sem_response);
return 0;
}
static struct modem_cmd check_attached_cmd =
MODEM_CMD("+CGATT:", on_cmd_atcmdinfo_attached, 1U, ",");
static struct setup_cmd connect_cmds[] = {
/* connect to network */
SETUP_CMD_NOHANDLE("ATD*99#"),
@ -340,6 +360,21 @@ static void gsm_finalize_connection(struct gsm_modem *gsm)
return;
}
/* Don't initialize PPP until we're attached to packet service */
ret = modem_cmd_send_nolock(&gsm->context.iface,
&gsm->context.cmd_handler,
&check_attached_cmd, 1,
"AT+CGATT?",
&gsm->sem_response,
GSM_CMD_SETUP_TIMEOUT);
if (ret < 0) {
LOG_DBG("Not attached, %s", "retrying...");
(void)k_delayed_work_submit(&gsm->gsm_configure_work,
K_SECONDS(1));
return;
}
LOG_DBG("modem setup returned %d, %s", ret, "enable PPP");
ret = modem_cmd_handler_setup_cmds(&gsm->context.iface,