Hi Denis,

On 30/03/2011 22:59, Denis Kenzior wrote:
> Hi Guillaume,
>
> On 03/25/2011 10:25 AM, Guillaume Zajac wrote:
>> ---
>>   gatchat/gsmdial.c |  164 ++++++++++++++++++++++++++++++++++++++++++++--------
>>   1 files changed, 138 insertions(+), 26 deletions(-)
>>
>> diff --git a/gatchat/gsmdial.c b/gatchat/gsmdial.c
>> index 92a7ff2..f1b485e 100644
>> --- a/gatchat/gsmdial.c
>> +++ b/gatchat/gsmdial.c
>> @@ -40,6 +40,8 @@
>>
>>   #define IFCONFIG_PATH "/sbin/ifconfig"
>>
>> +#define GUARD_TIMEOUTS 1500
>> +
>>   static const char *none_prefix[] = { NULL };
>>   static const char *cfun_prefix[] = { "+CFUN:", NULL };
>>   static const char *creg_prefix[] = { "+CREG:", NULL };
>> @@ -238,32 +240,6 @@ static gboolean execute(const char *cmd)
>>   	return TRUE;
>>   }
>>
>> -static void ppp_connect(const char *iface, const char *local, const char *peer,
>> -			const char *dns1, const char *dns2,
>> -			gpointer user_data)
>> -{
>> -	char buf[512];
>> -
>> -	/* print out the negotiated address and dns server */
>> -	g_print("Network Device: %s\n", iface);
>> -	g_print("IP Address: %s\n", local);
>> -	g_print("Peer IP Address: %s\n", peer);
>> -	g_print("Primary DNS Server: %s\n", dns1);
>> -	g_print("Secondary DNS Server: %s\n", dns2);
>> -
>> -	if (getuid() != 0) {
>> -		g_print("Need root privilege to config PPP interface\n");
>> -		return;
>> -	}
>> -
>> -	snprintf(buf, sizeof(buf), "%s %s up", IFCONFIG_PATH, iface);
>> -	execute(buf);
>> -
>> -	snprintf(buf, sizeof(buf), "%s %s %s pointopoint %s", IFCONFIG_PATH,
>> -				iface, local, peer);
>> -	execute(buf);
>> -}
>> -
>>   static void no_carrier_notify(GAtResult *result, gpointer user_data)
>>   {
>>   	char buf[64];
>> @@ -294,6 +270,142 @@ static void ppp_disconnect(GAtPPPDisconnectReason reason, gpointer user_data)
>>   	g_at_chat_resume(modem);
>>   }
>>
>> +static void power_down_ppp(gboolean ok, GAtResult *result, gpointer user_data)
>> +{
>> +	if (!ok)
>> +		return;
>> +
>> +	g_at_ppp_unref(ppp);
>> +	ppp = NULL;
>> +}
>> +
>> +static gboolean send_ATH0(gpointer user_data)
>> +{
>> +	/* Resume AT chat to send ATH0 */
>> +	g_at_chat_resume(modem);
>> +	g_at_chat_send(modem, "ATH0", none_prefix, power_down_ppp, NULL, NULL);
>> +
>> +	return FALSE;
>> +}
>> +
>> +static gboolean suspend_and_close(gpointer user_data)
>> +{
>> +	g_print("Send +++\n");
>> +	/* Send the escape sequence to suspend PPP server*/
>> +	g_at_io_write(g_at_chat_get_io(modem), "+++", 3);
>> +	
>> +	/*
>> +	 * Wait GUARD_TIMEOUTS ms before sending ATH0 cmd
>> +	 * according to guard timeouts
>> +	 */
>> +	g_timeout_add(GUARD_TIMEOUTS, send_ATH0, NULL);
>> +
>> +	return FALSE;
>> +}
>> +
>> +static void ppp_suspend_close(gpointer data)
>> +{
>> +	/* Delete the write done CB */
>> +	g_at_io_set_write_done(g_at_chat_get_io(modem), NULL, NULL);
>> +
>> +	/*
>> +	 * We are sure there are no more PPP packets to be written,
>> +	 * we can suspend PPP client
>> +	 */
>> +	g_at_ppp_suspend(ppp);
>> +
>> +	/* Wait GUARD_TIMEOUTS ms before sending escape sequence */
>> +	g_timeout_add(GUARD_TIMEOUTS, suspend_and_close, NULL);
>> +}
>> +
>> +static void suspend_gat_chat(gboolean ok, GAtResult *result, gpointer user_data)
>> +{
>> +	/*
>> +	 * As soon as the command is treated by AT server
>> +	 * we can suspend AT chat and resume PPP client
>> +	 */
>> +	g_at_chat_suspend(modem);
>> +	g_at_ppp_resume(ppp);
>> +
>> +	/*
>> +	 * We wait for another PPP packet to be written
>> +	 * to suspend again PPP server and close it
>> +	 */
>> +	g_at_io_set_write_done(g_at_chat_get_io(modem), ppp_suspend_close, NULL);
>> +}
>> +
>> +static gboolean send_ATO0(gpointer user_data)
>> +{
>> +	/* Resume AT chat to send ATO0 */
>> +	g_at_chat_resume(modem);
>> +	g_at_chat_send(modem, "ATO0", none_prefix, suspend_gat_chat, NULL, NULL);
>> +
>> +	return FALSE;
>> +}
>> +
>> +static gboolean suspend_resume(gpointer user_data)
>> +{
>> +	g_print("Send +++\n");
>> +	/* Send the escape sequence to suspend PPP server*/
>> +	g_at_io_write(g_at_chat_get_io(modem), "+++", 3);
>> +
>> +	/*
>> +	 * Wait GUARD_TIMEOUTS ms before sending ATO0 cmd
>> +	 * according to guard timeouts
>> +	 */
>> +	g_timeout_add(GUARD_TIMEOUTS, send_ATO0, NULL);
>> +
>> +	return FALSE;
>> +}
>> +
>> +static void ppp_suspend_resume(gpointer data)
>> +{
>> +	/* Delete the write done CB */
>> +	g_at_io_set_write_done(g_at_chat_get_io(modem), NULL, NULL);
>> +
>> +	/*
>> +	 * We are sure there are no more PPP packets to be written,
>> +	 * we can suspend PPP client
>> +	 */
>> +	g_at_ppp_suspend(ppp);
>> +
>> +	/* Wait GUARD_TIMEOUTS ms before sending escape sequence */
>> +	g_timeout_add(GUARD_TIMEOUTS, suspend_resume, NULL);
>> +}
>> +
> The logic for sending a guard timeout, +++, guard timeout should really
> belong in GAtChat, otherwise every single client has to repeat the same
> state machine.

I can implement a g_at_chat_send_escape_sequence() to manage:
<pause> --> +++ <pause> timing

I would still write directly on at_chat GAtIO because using 
at_chat_send_common() would add a '\r' that would cancel the suspend 
data call.

Kind regards,
Guillaume