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			evse_cm_mnbc_sound.c
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/*====================================================================*
 *
 *   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 &quot;AS IS&quot; 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 &lt;stdio.h&gt;
#include &lt;memory.h&gt;
#include &lt;sys/time.h&gt;

#include &quot;../ether/channel.h&quot;
#include &quot;../tools/memory.h&quot;
#include &quot;../tools/error.h&quot;
#include &quot;../tools/flags.h&quot;
#include &quot;../tools/timer.h&quot;
#include &quot;../iso15118/slac.h&quot;

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

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

#if SLAC_DEBUG

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

#endif

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

#if SLAC_DEBUG

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

#endif

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

#endif


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