add a diagram to introduce workflow of casting video player

[nicelyjust]

add a diagram, in order to illustrate more specifically steps

[github-actions]

PR #31707: Size comparison from 4fa072b to d690913

Decreases (1 build for efr32)

platform	target	config	section	4fa072b	d690913	change	% change
efr32	window-app	BRD4187C	(read/write)	1148024	1148016	-8	-0.0
			.text	977564	977556	-8	-0.0

Full report (73 builds for bl602, bl702, bl702l, cc13x4_26x4, cc32xx, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, psoc6, qpg, stm32, telink)

platform	target	config	section	4fa072b	d690913	change	% change
bl602	lighting-app	bl602	(read/write)	1428294	1428294	0	0.0
			.bss	85320	85320	0	0.0
			.data	9488	9488	0	0.0
			.rodata	157320	157320	0	0.0
			.text	1095520	1095520	0	0.0
		bl602+mfd	(read/write)	1442686	1442686	0	0.0
			.bss	85480	85480	0	0.0
			.data	9456	9456	0	0.0
			.rodata	156280	156280	0	0.0
			.text	1110822	1110822	0	0.0
		bl602+rpc	(read/write)	1475934	1475934	0	0.0
			.bss	93352	93352	0	0.0
			.data	9856	9856	0	0.0
			.rodata	164896	164896	0	0.0
			.text	1127162	1127162	0	0.0
bl702	lighting-app	bl702	(read only)	3478	3478	0	0.0
			(read/write)	1193219	1193219	0	0.0
			.bss	11121	11121	0	0.0
			.data	3664	3664	0	0.0
			.rodata	106708	106708	0	0.0
			.text	964908	964908	0	0.0
		bl702+mfd	(read only)	3478	3478	0	0.0
			(read/write)	1204043	1204043	0	0.0
			.bss	11297	11297	0	0.0
			.data	3648	3648	0	0.0
			.rodata	105648	105648	0	0.0
			.text	976662	976662	0	0.0
		bl702+rpc	(read only)	3478	3478	0	0.0
			(read/write)	1284711	1284711	0	0.0
			.bss	19589	19589	0	0.0
			.data	4216	4216	0	0.0
			.rodata	122080	122080	0	0.0
			.text	1039612	1039612	0	0.0
		bl706-eth	(read/write)	1011753	1011753	0	0.0
			.bss	23680	23680	0	0.0
			.data	3240	3240	0	0.0
			.rodata	100028	100028	0	0.0
			.text	756852	756852	0	0.0
		bl706-wifi	(read/write)	1244634	1244634	0	0.0
			.bss	10565	10565	0	0.0
			.data	3672	3672	0	0.0
			.rodata	121008	121008	0	0.0
			.text	987000	987000	0	0.0
bl702l	lighting-app	bl702l	(read only)	512	512	0	0.0
			(read/write)	1162556	1162556	0	0.0
			.bss	16316	16316	0	0.0
			.data	5032	5032	0	0.0
			.rodata	100712	100712	0	0.0
			.text	957758	957758	0	0.0
		bl702l+mfd	(read only)	512	512	0	0.0
			(read/write)	1173952	1173952	0	0.0
			.bss	16492	16492	0	0.0
			.data	5008	5008	0	0.0
			.rodata	99652	99652	0	0.0
			.text	970080	970080	0	0.0
cc13x4_26x4	lighting-app	LP_EM_CC1354P10_6	(read only)	781428	781428	0	0.0
			(read/write)	168856	168856	0	0.0
			.bss	90876	90876	0	0.0
			.data	3552	3552	0	0.0
			.rodata	90316	90316	0	0.0
			.text	690848	690848	0	0.0
	lock-ftd	LP_EM_CC1354P10_6	(read only)	798860	798860	0	0.0
			(read/write)	179100	179100	0	0.0
			.bss	101060	101060	0	0.0
			.data	3580	3580	0	0.0
			.rodata	84636	84636	0	0.0
			.text	713956	713956	0	0.0
	lock-mtd	LP_EM_CC1354P10_6	(read only)	787380	787380	0	0.0
			(read/write)	173556	173556	0	0.0
			.bss	95516	95516	0	0.0
			.data	3580	3580	0	0.0
			.rodata	111388	111388	0	0.0
			.text	675724	675724	0	0.0
	pump-app	LP_EM_CC1354P10_6	(read only)	738700	738700	0	0.0
			(read/write)	167828	167828	0	0.0
			.bss	89616	89616	0	0.0
			.data	3540	3540	0	0.0
			.rodata	86036	86036	0	0.0
			.text	652400	652400	0	0.0
	pump-controller-app	LP_EM_CC1354P10_6	(read only)	724332	724332	0	0.0
			(read/write)	168040	168040	0	0.0
			.bss	89840	89840	0	0.0
			.data	3536	3536	0	0.0
			.rodata	81884	81884	0	0.0
			.text	642184	642184	0	0.0
cc32xx	air-purifier	CC3235SF_LAUNCHXL	(read only)	572986	572986	0	0.0
			(read/write)	207872	207872	0	0.0
			.bss	201156	201156	0	0.0
			.data	1592	1592	0	0.0
			.rodata	84530	84530	0	0.0
			.text	486336	486336	0	0.0
	lock	CC3235SF_LAUNCHXL	(read only)	627266	627266	0	0.0
			(read/write)	208288	208288	0	0.0
			.bss	201648	201648	0	0.0
			.data	1520	1520	0	0.0
			.rodata	106402	106402	0	0.0
			.text	518740	518740	0	0.0
cyw30739	light	cyw930739m2evb_01	(read/write)	564355	564355	0	0.0
			.app_xip_area	454277	454277	0	0.0
			.bss	64920	64920	0	0.0
			.data	732	732	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
	lock	cyw930739m2evb_01	(read/write)	547995	547995	0	0.0
			.app_xip_area	433173	433173	0	0.0
			.bss	69624	69624	0	0.0
			.data	772	772	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
	ota-requestor	cyw930739m2evb_01	(read/write)	566163	566163	0	0.0
			.app_xip_area	457549	457549	0	0.0
			.bss	63496	63496	0	0.0
			.data	696	696	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
	switch	cyw930739m2evb_01	(read/write)	562451	562451	0	0.0
			.app_xip_area	450597	450597	0	0.0
			.bss	66624	66624	0	0.0
			.data	804	804	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
efr32	lighting-app	BRD4161A+rs9116	(read/write)	930408	930408	0	0.0
			.bss	197904	197904	0	0.0
			.data	1372	1372	0	0.0
			.text	731112	731112	0	0.0
		BRD4187C	(read/write)	1108252	1108252	0	0.0
			.bss	195156	195156	0	0.0
			.data	3384	3384	0	0.0
			.text	909692	909692	0	0.0
	lock-app	BRD4161A+wf200	(read/write)	1121680	1121680	0	0.0
			.bss	188184	188184	0	0.0
			.data	2800	2800	0	0.0
			.text	930676	930676	0	0.0
	window-app	BRD4187C	(read/write)	1148024	1148016	-8	-0.0
			.bss	167148	167148	0	0.0
			.data	3292	3292	0	0.0
			.text	977564	977556	-8	-0.0
esp32	all-clusters-app	c3devkit	(read only)	1199926	1199926	0	0.0
			(read/write)	1744760	1744760	0	0.0
			.dram0.bss	73392	73392	0	0.0
			.dram0.data	13588	13588	0	0.0
			.flash.rodata	248248	248248	0	0.0
			.flash.text	1199926	1199926	0	0.0
			.iram0.text	75530	75530	0	0.0
		m5stack	(read only)	1241251	1241251	0	0.0
			(read/write)	529704	529704	0	0.0
			.dram0.bss	80256	80256	0	0.0
			.dram0.data	35132	35132	0	0.0
			.flash.rodata	278396	278396	0	0.0
			.flash.text	1235087	1235087	0	0.0
			.iram0.text	125403	125403	0	0.0
k32w	contact	k32w0+release	(read only)	610608	610608	0	0.0
			(read/write)	81316	81316	0	0.0
			.bss	69096	69096	0	0.0
			.data	2236	2236	0	0.0
			.text	610072	610072	0	0.0
		k32w1+release	(read only)	1024	1024	0	0.0
			(read/write)	696284	696284	0	0.0
			.bss	67752	67752	0	0.0
			.data	2788	2788	0	0.0
			.text	582272	582272	0	0.0
	light	k32w0+release	(read only)	598968	598968	0	0.0
			(read/write)	79324	79324	0	0.0
			.bss	67152	67152	0	0.0
			.data	2188	2188	0	0.0
			.text	598432	598432	0	0.0
		k32w1+release	(read only)	1024	1024	0	0.0
			(read/write)	787264	787264	0	0.0
			.bss	77420	77420	0	0.0
			.data	2000	2000	0	0.0
			.text	664392	664392	0	0.0
	lock	k32w0+release	(read only)	580248	580248	0	0.0
			(read/write)	78740	78740	0	0.0
			.bss	66592	66592	0	0.0
			.data	2164	2164	0	0.0
			.text	579712	579712	0	0.0
linux	air-purifier-app	debug	(read only)	2576837	2576837	0	0.0
			(read/write)	127608	127608	0	0.0
			.bss	46240	46240	0	0.0
			.data	2176	2176	0	0.0
			.data.rel.ro	73272	73272	0	0.0
			.dynamic	608	608	0	0.0
			.got	4552	4552	0	0.0
			.init	27	27	0	0.0
			.init_array	752	752	0	0.0
			.rodata	181480	181480	0	0.0
			.text	2219093	2219093	0	0.0
	all-clusters-app	debug	(read only)	5789833	5789833	0	0.0
			(read/write)	470432	470432	0	0.0
			.bss	132960	132960	0	0.0
			.data	4432	4432	0	0.0
			.data.rel.ro	325656	325656	0	0.0
			.dynamic	624	624	0	0.0
			.got	5376	5376	0	0.0
			.init	27	27	0	0.0
			.init_array	1336	1336	0	0.0
			.rodata	342532	342532	0	0.0
			.text	5022499	5022499	0	0.0
	all-clusters-minimal-app	debug	(read only)	5134561	5134561	0	0.0
			(read/write)	235264	235264	0	0.0
			.bss	127328	127328	0	0.0
			.data	4336	4336	0	0.0
			.data.rel.ro	96536	96536	0	0.0
			.dynamic	624	624	0	0.0
			.got	5296	5296	0	0.0
			.init	27	27	0	0.0
			.init_array	1112	1112	0	0.0
			.rodata	285653	285653	0	0.0
			.text	4615539	4615539	0	0.0
	bridge-app	debug	(read only)	4551105	4551105	0	0.0
			(read/write)	216496	216496	0	0.0
			.bss	117920	117920	0	0.0
			.data	6144	6144	0	0.0
			.data.rel.ro	85712	85712	0	0.0
			.dynamic	624	624	0	0.0
			.got	5264	5264	0	0.0
			.init	27	27	0	0.0
			.init_array	808	808	0	0.0
			.rodata	227221	227221	0	0.0
			.text	4104355	4104355	0	0.0
	chip-tool	debug	(read only)	12109721	12109721	0	0.0
			(read/write)	517808	517808	0	0.0
			.bss	94232	94232	0	0.0
			.data	5090	5090	0	0.0
			.data.rel.ro	411232	411232	0	0.0
			.dynamic	624	624	0	0.0
			.got	5784	5784	0	0.0
			.init	27	27	0	0.0
			.init_array	784	784	0	0.0
			.rodata	440409	440409	0	0.0
			.text	10962051	10962051	0	0.0
	chip-tool-ipv6only	arm64	(read only)	11642416	11642416	0	0.0
			(read/write)	585936	585936	0	0.0
			.bss	103288	103288	0	0.0
			.data	4472	4472	0	0.0
			.data.rel.ro	450792	450792	0	0.0
			.dynamic	512	512	0	0.0
			.got	20400	20400	0	0.0
			.init	24	24	0	0.0
			.init_array	248	248	0	0.0
			.rodata	347820	347820	0	0.0
			.text	10405260	10405260	0	0.0
	lighting-app	debug+rpc+ui	(read only)	5470033	5470033	0	0.0
			(read/write)	225256	225256	0	0.0
			.bss	118848	118848	0	0.0
			.data	4800	4800	0	0.0
			.data.rel.ro	94112	94112	0	0.0
			.dynamic	672	672	0	0.0
			.got	5880	5880	0	0.0
			.init	27	27	0	0.0
			.init_array	928	928	0	0.0
			.rodata	350964	350964	0	0.0
			.text	4873443	4873443	0	0.0
	lock-app	debug	(read only)	4621729	4621729	0	0.0
			(read/write)	204080	204080	0	0.0
			.bss	113280	113280	0	0.0
			.data	4128	4128	0	0.0
			.data.rel.ro	79960	79960	0	0.0
			.dynamic	624	624	0	0.0
			.got	5216	5216	0	0.0
			.init	27	27	0	0.0
			.init_array	840	840	0	0.0
			.rodata	253845	253845	0	0.0
			.text	4156899	4156899	0	0.0
	ota-provider-app	debug	(read only)	4259825	4259825	0	0.0
			(read/write)	192688	192688	0	0.0
			.bss	113184	113184	0	0.0
			.data	4288	4288	0	0.0
			.data.rel.ro	69328	69328	0	0.0
			.dynamic	624	624	0	0.0
			.got	4528	4528	0	0.0
			.init	27	27	0	0.0
			.init_array	712	712	0	0.0
			.rodata	206421	206421	0	0.0
			.text	3861507	3861507	0	0.0
	ota-requestor-app	debug	(read only)	4375841	4375841	0	0.0
			(read/write)	196936	196936	0	0.0
			.bss	114080	114080	0	0.0
			.data	4688	4688	0	0.0
			.data.rel.ro	72288	72288	0	0.0
			.dynamic	624	624	0	0.0
			.got	4464	4464	0	0.0
			.init	27	27	0	0.0
			.init_array	768	768	0	0.0
			.rodata	212309	212309	0	0.0
			.text	3967331	3967331	0	0.0
	shell	debug	(read only)	2868241	2868241	0	0.0
			(read/write)	154848	154848	0	0.0
			.bss	62224	62224	0	0.0
			.data	1360	1360	0	0.0
			.data.rel.ro	85480	85480	0	0.0
			.dynamic	592	592	0	0.0
			.got	4088	4088	0	0.0
			.init	27	27	0	0.0
			.init_array	1064	1064	0	0.0
			.rodata	185632	185632	0	0.0
			.text	2510226	2510226	0	0.0
	thermostat-no-ble	arm64	(read only)	4448504	4448504	0	0.0
			(read/write)	246992	246992	0	0.0
			.bss	121672	121672	0	0.0
			.data	3344	3344	0	0.0
			.data.rel.ro	103272	103272	0	0.0
			.dynamic	512	512	0	0.0
			.got	12168	12168	0	0.0
			.init	24	24	0	0.0
			.init_array	416	416	0	0.0
			.rodata	158460	158460	0	0.0
			.text	3946188	3946188	0	0.0
	tv-app	debug	(read only)	5583857	5583857	0	0.0
			(read/write)	350320	350320	0	0.0
			.bss	243200	243200	0	0.0
			.data	6496	6496	0	0.0
			.data.rel.ro	93336	93336	0	0.0
			.dynamic	624	624	0	0.0
			.got	5512	5512	0	0.0
			.init	27	27	0	0.0
			.init_array	1128	1128	0	0.0
			.rodata	284405	284405	0	0.0
			.text	5059523	5059523	0	0.0
	tv-casting-app	debug	(read only)	9978305	9978305	0	0.0
			(read/write)	342456	342456	0	0.0
			.bss	156000	156000	0	0.0
			.data	2912	2912	0	0.0
			.data.rel.ro	176648	176648	0	0.0
			.dynamic	624	624	0	0.0
			.got	5088	5088	0	0.0
			.init	27	27	0	0.0
			.init_array	1168	1168	0	0.0
			.rodata	377224	377224	0	0.0
			.text	9128691	9128691	0	0.0
mbed	lock-app-release	cy8cproto_062_4343w	(read only)	6224	6224	0	0.0
			(read/write)	2531184	2531184	0	0.0
			.bss	220384	220384	0	0.0
			.data	5208	5208	0	0.0
			.text	1493868	1493868	0	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read only)	4	4	0	0.0
			(read/write)	1095820	1095820	0	0.0
			bss	129785	129785	0	0.0
			rodata	111372	111372	0	0.0
			text	806940	806940	0	0.0
		nrf7002dk_nrf5340_cpuapp	(read only)	4	4	0	0.0
			(read/write)	1216180	1216180	0	0.0
			bss	121923	121923	0	0.0
			rodata	141176	141176	0	0.0
			text	802584	802584	0	0.0
	all-clusters-minimal-app	nrf52840dk_nrf52840	(read only)	4	4	0	0.0
			(read/write)	1045332	1045332	0	0.0
			bss	129511	129511	0	0.0
			rodata	99204	99204	0	0.0
			text	768880	768880	0	0.0
psoc6	all-clusters	cy8ckit_062s2_43012	(read only)	835368	835368	0	0.0
			(read/write)	1792908	1792908	0	0.0
			.bss	195332	195332	0	0.0
			.data	2640	2640	0	0.0
			.text	1586548	1586548	0	0.0
	all-clusters-minimal	cy8ckit_062s2_43012	(read only)	837672	837672	0	0.0
			(read/write)	1715444	1715444	0	0.0
			.bss	193052	193052	0	0.0
			.data	2616	2616	0	0.0
			.text	1511388	1511388	0	0.0
	light	cy8ckit_062s2_43012	(read only)	844360	844360	0	0.0
			(read/write)	1636436	1636436	0	0.0
			.bss	186548	186548	0	0.0
			.data	2432	2432	0	0.0
			.text	1439068	1439068	0	0.0
	lock	cy8ckit_062s2_43012	(read only)	817240	817240	0	0.0
			(read/write)	1665756	1665756	0	0.0
			.bss	213644	213644	0	0.0
			.data	2456	2456	0	0.0
			.text	1441268	1441268	0	0.0
qpg	lighting-app	qpg6105+debug	(read/write)	1122692	1122692	0	0.0
			.bss	102344	102344	0	0.0
			.data	808	808	0	0.0
			.text	635072	635072	0	0.0
	lock-app	qpg6105+debug	(read/write)	1086212	1086212	0	0.0
			.bss	98528	98528	0	0.0
			.data	852	852	0	0.0
			.text	598588	598588	0	0.0
stm32	light	STM32WB5MM-DK	(read/write)	597581	597581	0	0.0
			.bss	128280	128280	0	0.0
			.data	660	660	0	0.0
			.rodata	78748	78748	0	0.0
			.text	380168	380168	0	0.0
telink	air-quality-sensor-app	tlsr9528a_retention	(read only)	51774	51774	0	0.0
			(read/write)	825686	825686	0	0.0
			bss	51012	51012	0	0.0
			text	617652	617652	0	0.0
	all-clusters-app	tlsr9518adk80d	(read only)	4	4	0	0.0
			(read/write)	1114692	1114692	0	0.0
			bss	100768	100768	0	0.0
			text	789338	789338	0	0.0
	all-clusters-minimal-app	tlsr9528a	(read only)	4	4	0	0.0
			(read/write)	1091940	1091940	0	0.0
			bss	109904	109904	0	0.0
			text	760356	760356	0	0.0
	bridge-app	tlsr9518adk80d	(read only)	4	4	0	0.0
			(read/write)	935944	935944	0	0.0
			bss	92976	92976	0	0.0
			text	649750	649750	0	0.0
	contact-sensor-app	tlsr9528a_retention	(read only)	51774	51774	0	0.0
			(read/write)	827586	827586	0	0.0
			bss	51064	51064	0	0.0
			text	619610	619610	0	0.0
	light-switch-app-ota-shell-factory-data	tlsr9528a	(read only)	4	4	0	0.0
			(read/write)	985532	985532	0	0.0
			bss	79104	79104	0	0.0
			text	700330	700330	0	0.0
	lighting-app-ota-rpc-factory-data-4mb	tlsr9518adk80d	(read only)	4	4	0	0.0
			(read/write)	1097940	1097940	0	0.0
			bss	100056	100056	0	0.0
			text	773980	773980	0	0.0
	lock-app-dfu	tlsr9528a	(read only)	4	4	0	0.0
			(read/write)	971464	971464	0	0.0
			bss	97408	97408	0	0.0
			text	653520	653520	0	0.0
	ota-requestor-app	tlsr9518adk80d	(read only)	4	4	0	0.0
			(read/write)	953784	953784	0	0.0
			bss	92552	92552	0	0.0
			text	667696	667696	0	0.0
	pump-app	tlsr9528a	(read only)	4	4	0	0.0
			(read/write)	884848	884848	0	0.0
			bss	69128	69128	0	0.0
			text	626154	626154	0	0.0
	pump-controller-app	tlsr9518adk80d	(read only)	4	4	0	0.0
			(read/write)	825492	825492	0	0.0
			bss	57372	57372	0	0.0
			text	593078	593078	0	0.0
	shell	tlsr9518adk80d	(read only)	4	4	0	0.0
			(read/write)	705772	705772	0	0.0
			bss	73640	73640	0	0.0
			text	462164	462164	0	0.0
	smoke_co_alarm-app	tlsr9528a_retention	(read only)	51774	51774	0	0.0
			(read/write)	829330	829330	0	0.0
			bss	51192	51192	0	0.0
			text	622380	622380	0	0.0
	temperature-measurement-app-mars-ota	tlsr9518adk80d	(read only)	4	4	0	0.0
			(read/write)	884129	884129	0	0.0
			bss	60848	60848	0	0.0
			text	636200	636200	0	0.0
	thermostat	tlsr9518adk80d	(read only)	4	4	0	0.0
			(read/write)	851808	851808	0	0.0
			bss	57660	57660	0	0.0
			text	613374	613374	0	0.0
	window-covering	tlsr9518adk80d	(read only)	4	4	0	0.0
			(read/write)	844548	844548	0	0.0
			bss	57972	57972	0	0.0
			text	605992	605992	0	0.0

[sharadb-amazon]

1. Why does the "discover" arrow from the CastingClient just loop back upon itself? Shouldn't it touch the CastingPlayer or something else on the network?
2. Note that the CastingClient does not always need to send the User Directed Commissioning request. After it has been commissioned by the CastingPlayer once, it is simply able to re-establish CASE the next time it wants to cast to the same CastingPlayer (using a cached nodeId, fabricIndex). This is taken care of under-the-hood, by the VerifyOrEstablishConnection API.