evse_cm_mnbc_sound.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * Redistributions in binary form must reproduce the above
     *     copyright notice, this list of conditions and the following
     *     disclaimer in the documentation and/or other materials
     *     provided with the distribution.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
     *   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     *   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     *   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     *   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   signed evse_cm_mnbc_sound (struct session * session, struct channel * channel, struct message * message);
     *
     *   slac.h
     *
     *   the GP specification recommends that the EVSE-HLE set an overall
     *   timer once the cm_start_atten_char message is received and use it
     *   to terminate the msound loop in case some msounds are lost;
     *
     *   accept only CM_MNBC_SOUND.IND that match RunID from the earlier
     *   CM_SLAC_PARAM.REQ and CM_START_ATTRN_CHAT.IND;
     *
     *   each CM_MNBC_MSOUND.IND is accompanied by a CM_ATTEN_PROFILE.IND
     *   but sometimes they arrive out of expected order;
     *
     *   store the running total of CM_ATTEN_PROFILE.IND.AAG values in
     *   the session variable and compute the average based on actual
     *   number of sounds before returning;
     *
     *--------------------------------------------------------------------*/

    #ifndef EVSE_CM_MNBC_SOUND_SOURCE
    #define EVSE_CM_MNBC_SOUND_SOURCE

    #include <stdio.h>
    #include <memory.h>
    #include <sys/time.h>

    #include "../ether/channel.h"
    #include "../tools/memory.h"
    #include "../tools/error.h"
    #include "../tools/flags.h"
    #include "../tools/timer.h"
    #include "../iso15118/slac.h"

    signed evse_cm_mnbc_sound (struct session * session, struct channel * channel, struct message * message)

    {
    	struct timeval ts;
    	struct timeval tc;
    	signed timer = 100 * session->TIME_OUT;
    	unsigned AAG [SLAC_GROUPS];
    	unsigned sounds = 0;
    	ssize_t length;
    	session->sounds = 0;
    	memset (AAG, 0, sizeof (AAG));
    	memset (session->AAG, 0, sizeof (session->AAG));
    	if (gettimeofday (& ts, NULL) == - 1)
    	{
    		slac_debug (session, 1, __func__, CANT_START_TIMER);
    	}
    	while ((length = readpacket (channel, message, sizeof (* message))) >= 0)
    	{
    		struct homeplug * homeplug = (struct homeplug *) (message);
    		if (! length)
    		{
    		}
    		else if (ntohs (homeplug->ethernet.MTYPE) != ETH_P_HPAV)
    		{
    			slac_debug (session, session->exit, __func__, "bad MTYPE");
    		}
    		else if (homeplug->homeplug.MMV != HOMEPLUG_MMV)
    		{
    			slac_debug (session, session->exit, __func__, "bad MMV");
    		}
    		else if (LE16TOH (homeplug->homeplug.MMTYPE) == (CM_MNBC_SOUND | MMTYPE_IND))
    		{
    			struct cm_mnbc_sound_indicate * indicate = (struct cm_mnbc_sound_indicate *) (message);
    			if (! memcmp (session->RunID, indicate->MSVarField.RunID, sizeof (session->RunID)))
    			{
    				slac_debug (session, 0, __func__, "<-- CM_MNBC_SOUND.IND (%d)", sounds);

    #if SLAC_DEBUG

    				if (_anyset (session->flags, SLAC_VERBOSE))
    				{
    					char string [256];
    					slac_debug (session, 0, __func__, "CM_MNBC_SOUND.IND.APPLICATION_TYPE %d", indicate->APPLICATION_TYPE);
    					slac_debug (session, 0, __func__, "CM_MNBC_SOUND.IND.SECURITY_TYPE %d", indicate->SECURITY_TYPE);
    					slac_debug (session, 0, __func__, "CM_MNBC_SOUND.IND.MSVarField.SenderID %s", HEXSTRING (string, indicate->MSVarField.SenderID));
    					slac_debug (session, 0, __func__, "CM_MNBC_SOUND.IND.MSVarField.Count %d", indicate->MSVarField.CNT);
    					slac_debug (session, 0, __func__, "CM_MNBC_SOUND.IND.MSVarField.RunID %s", HEXSTRING (string, indicate->MSVarField.RunID));
    					slac_debug (session, 0, __func__, "CM_MNBC_SOUND.IND.MSVarField.RND %s", HEXSTRING (string, indicate->MSVarField.RND));
    				}

    #endif

    				if (memcmp (session->PEV_MAC, indicate->ethernet.OSA, sizeof (session->PEV_MAC)))
    				{
    					slac_debug (session, session->exit, __func__, "Unexpected OSA");
    				}
    				sounds++;
    			}
    		}
    		else if (LE16TOH (homeplug->homeplug.MMTYPE) == (CM_ATTEN_PROFILE | MMTYPE_IND))
    		{
    			struct cm_atten_profile_indicate * indicate = (struct cm_atten_profile_indicate *) (message);
    			if (! memcmp (session->PEV_MAC, indicate->PEV_MAC, sizeof (session->PEV_MAC)))
    			{
    				slac_debug (session, 0, __func__, "<-- CM_ATTEN_PROFILE.IND (%d)", session->sounds);

    #if SLAC_DEBUG

    				if (_anyset (session->flags, SLAC_VERBOSE))
    				{
    					char string [256];
    					slac_debug (session, 0, __func__, "CM_ATTEN_PROFILE.PEV_MAC %s", HEXSTRING (string, indicate->PEV_MAC));
    					slac_debug (session, 0, __func__, "CM_ATTEN_PROFILE.NumGroups %d", indicate->NumGroups);
    					slac_debug (session, 0, __func__, "CM_ATTEN_PROFILE.AAG %s", hexstring (string, sizeof (string), indicate->AAG, indicate->NumGroups));
    				}

    #endif

    				for (session->NumGroups = 0; session->NumGroups < indicate->NumGroups; session->NumGroups++)
    				{
    					AAG [session->NumGroups] += indicate->AAG [session->NumGroups];
    				}
    				session->NumGroups = indicate->NumGroups;
    				session->sounds++;
    			}
    		}
    		if (gettimeofday (& tc, NULL) == - 1)
    		{
    			slac_debug (session, 1, __func__, CANT_RESET_TIMER);
    		}
    		if ((MILLISECONDS (ts, tc) < timer) && (session->sounds < session->NUM_SOUNDS))
    		{
    			continue;
    		}
    		if (session->sounds > 0)
    		{
    			for (session->NumGroups = 0; session->NumGroups < SLAC_GROUPS; ++ session->NumGroups)
    			{
    				session->AAG [session->NumGroups] = AAG [session->NumGroups] / session->sounds;
    			}
    		}
    		return (0);
    	}
    	return (slac_debug (session, session->exit, __func__, "Sound timeout"));
    }

    #endif

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