Sinon je me suis fait un script en python avec pymodbus pour scanner tous les registres de la télécommande, et j’ai filtré tous ceux qui renvoyaient 0xFF.
Résultat : 1731 registres remplis 
(dont 1048 qui valent 0)
Mais je pense avoir trouvé les consignes des thermostats et les températures des pièces.
Echangeur eau chaude
106:1259
Sonde ECS haut
111: 5057
Sonde ECS bas
112: 4539
ECS ligne liquide th4
113:2898
Ligne gaz th3
115:2777
Echangeur air crosse th5
116:2596
Echangeur air capillaire th6
117:2620
Volume restant ECS:
149:165
Thermostats :
170:1800
171:1800
172:1900
173:2300
Températures :
190:2300
191:2300
192:2281
193:2331
194:2237
Maintenant que j’y accède en python je vais pouvoir y ajouter un peu de logique pour tenter de décrypter.
Registres
[1,2,3,4,5,6,7,8,9,10,11,12,14,15,16,17,18,19,21,22,
23,24,25,26,29,30,32,33,35,36,37,38,39,40,41,42,43,44,45,46,
47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,
67,68,69,70,71,72,73,76,78,79,80,81,82,83,84,85,86,87,88,89,
90,91,92,93,94,95,96,97,98,99,100,101,102,103,105,106,107,108,109,110,
111,112,113,114,115,116,117,118,119,120,121,122,123,124,127,128,129,130,131,132,
133,134,135,136,137,138,139,141,142,144,145,148,149,150,151,152,153,157,158,159,
160,161,162,170,171,172,173,174,175,176,177,178,179,190,191,192,193,194,195,196,
197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,
217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,
237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,256,
257,258,259,260,261,262,263,264,265,266,267,268,269,270,271,272,273,274,275,276,
277,278,279,280,281,282,283,284,285,286,287,288,289,290,291,292,293,294,295,296,
297,298,299,300,301,302,303,304,305,306,307,308,309,310,311,312,313,314,315,316,
317,318,319,320,321,322,323,324,325,326,327,328,329,330,331,332,333,334,335,336,
337,338,339,340,341,342,343,344,345,346,347,348,349,350,351,352,353,354,355,356,
357,358,359,360,361,362,363,364,365,366,367,368,369,378,379,380,381,382,383,384,
385,386,387,388,390,399,400,401,402,403,404,405,406,407,408,409,410,411,412,413,
414,415,416,417,418,419,420,421,422,423,424,425,426,427,428,429,430,431,432,433,
434,435,436,437,438,439,440,441,442,443,444,445,446,447,448,449,450,451,452,453,
454,455,456,457,458,459,460,461,462,463,464,465,466,467,468,469,470,471,472,473,
474,475,476,478,479,480,481,482,483,484,486,492,494,730,731,732,733,734,735,736,
737,788,800,801,802,803,804,805,806,807,808,809,810,811,812,813,814,815,816,817,
818,819,820,821,822,823,824,825,826,827,828,829,830,831,832,833,834,835,1000,1001,
1002,1003,1004,1005,1006,1007,1008,1009,1010,1011,1012,1013,1014,1015,1016,1020,1021,1022,1023,1024,
1025,1026,1027,1028,1029,1030,1031,1032,1033,1034,1035,2100,2101,2102,2103,2104,2105,2106,2107,2108,
2109,2110,5001,5002,5003,5004,5005,5006,5007,5008,5010,5011,5012,5027,5028,5029,5030,5031,5035,5036,
5037,5038,5039,5040,5041,5042,5043,5050,5051,5052,5053,5054,5055,6000,6002,6003,6004,6005,6006,6007,
6008,6009,6010,6011,6012,6013,6014,6016,6017,6018,6020,6021,6022,6023,6024,6025,6026,6027,6028,6031,
6032,6033,6034,6037,6038,6039,6040,6042,6043,6044,6045,6046,6048,6049,6050,6056,6057,6058,6059,6060,
6061,6062,6063,6064,6065,6066,6072,6073,6074,6080,6098,6100,6101,6102,6103,6104,6105,6106,6107,6108,
6109,6110,6111,6112,6113,6114,6115,6116,6117,6118,6119,6220,6222,6223,6224,6225,6226,6227,6228,6229,
6230,20000,20001,20002,20003,20004,20005,20006,20007,20008,20009,20010,20011,20012,20013,20015,20016,20017,20018,20019,
20020,20021,20022,20023,20025,20026,20027,20029,20030,20031,20032,20033,20034,20035,20036,20037,20038,20039,20040,20041,
20042,20043,20044,20045,20046,20047,20048,20049,20050,20051,20052,20053,20054,20055,20056,20057,20058,20059,20060,20061,
20062,20063,20064,20066,20067,20068,20069,20070,20071,20072,20073,20074,20075,20076,20077,20078,20079,20080,20081,20082,
20083,20084,20085,20086,20087,20088,20089,20090,20091,20092,20093,20094,20095,20096,20097,20098,20099,20100,20101,20102,
20103,20104,20105,20106,20107,20108,20109,20110,20111,20112,20113,20114,20115,20116,20117,20118,20119,20120,20121,20122,
20123,20124,20125,20126,20127,20128,20129,20130,20131,20132,20133,20134,20139,20140,20141,20142,20143,20144,20145,20146,
20147,20148,20149,20150,20151,20152,20153,20154,20155,20156,20157,20158,20159,20160,20161,20162,20163,20164,20165,20166,
20167,20168,20169,20170,20171,20172,20173,20174,20175,20176,20177,20178,20179,20180,20181,20182,20183,20184,20185,20186,
20187,20188,20190,20191,20192,20193,20194,20195,20196,20197,20198,20199,20200,20201,20202,20203,20204,20205,20206,20207,
20208,20209,20210,20211,20212,20213,20214,20215,20216,20217,20218,20219,20220,20221,20222,20223,20224,20225,20226,20227,
20228,20229,20230,20231,20232,20233,20234,20235,20236,20237,20238,20239,20240,20241,20242,20243,20244,20245,20246,20247,
20248,20249,20250,20251,20252,20253,20254,20255,20256,20257,20258,20259,20260,20261,20262,20263,20264,20265,20266,20267,
20268,20270,20271,20272,20273,20274,20275,20276,20277,20278,20279,21000,21002,21003,21004,21005,21010,21011,21012,21013,
21014,21015,21100,21101,21102,21103,21104,21105,21106,21107,21108,21109,21110,21111,21112,21113,21114,21115,21116,21117,
21118,21119,21120,21121,21122,21123,21124,21125,21126,21127,21200,21201,21202,21203,21204,21205,21206,21207,21208,21209,
21210,21211,21212,21213,21214,21215,21216,21217,21218,21219,21220,21221,21222,21224,21225,21226,21227,21228,21229,21230,
21231,21232,21233,21234,21235,21236,21237,21238,21239,21300,21301,21302,21303,21304,21305,21306,21307,21308,21309,21310,
21311,21312,21313,21314,21315,21316,21317,21318,21319,21320,21321,21322,21323,21324,21325,21326,21327,21328,21329,21330,
21331,21332,21333,21334,21335,21336,21337,21338,21339,21340,21341,21342,21343,21344,21345,21346,21347,21348,21349,21350,
21351,21352,21353,21354,21355,21356,21357,21358,21359,21360,21361,21362,21363,21364,21365,21366,21367,21368,21369,21370,
21371,21372,21373,21374,21375,21376,21377,21378,21379,21380,21381,21382,21383,21384,21385,21386,21387,21388,21389,21390,
21391,21392,21393,21394,21395,21396,21397,21398,21399,21400,21401,21402,21403,21404,21405,21406,21407,21408,21409,21410,
21411,21412,21413,21414,21415,21416,21417,21418,21419,21420,21421,21422,21423,21424,21425,21426,21427,21428,21429,21430,
21431,21432,21433,21434,21435,21436,21437,21438,21439,21440,21441,21442,21443,21444,21445,21446,21447,21448,21449,21450,
21451,21452,21453,21454,21455,21456,21457,21458,21459,21460,21461,21462,21463,21464,21465,21466,21467,21468,21469,21470,
21471,21472,21473,21474,21475,21476,21477,21478,21479,21480,21481,21482,21483,21484,21485,21486,21487,21488,21489,21490,
21491,21492,21493,21494,21495,21496,21497,21498,21499,21500,21501,21502,21503,21504,21505,21506,21507,21508,21509,21510,
21511,21512,21513,21514,21515,21516,21517,21518,21519,21520,21521,21522,21523,21524,21525,21526,21527,21528,21529,21530,
21531,21532,21533,21534,21535,21536,21537,21538,21539,21540,21541,21542,21543,21544,21545,21546,21547,21548,21549,21550,
21551,21552,21553,21554,21555,21556,21557,21558,21559,21560,21561,21562,21563,21564,21565,21566,21567,21568,21569,21570,
21571,21572,21573,21574,21575,21576,21577,21578,21579,21580,21581,21582,21583,21584,21585,21586,21587,21588,21589,21590,
21591,21592,21593,21594,21595,21596,21597,21598,21599,21600,21601,21602,21603,21604,21605,21606,21607,21608,21609,21610,
21611,21612,21613,21614,21615,21616,21617,21618,21619,21620,21621,21622,21623,21624,21625,21626,21627,21628,21629,21630,
21631,21632,21633,21634,21635,21636,21637,21638,21639,21640,21641,21642,21643,21644,21645,21646,21647,21648,21649,21650,
21651,21652,21653,21654,21655,21656,21657,21658,21659,21660,21661,21662,21663,21664,21665,21666,21667,21668,21669,21670,
21671,21672,21673,21674,21675,21676,21677,21678,21679,21680,21681,21682,21683,21685,21686,21687,21688,21689,21690,21691,
30000,30001,30002,30003,30004,30005,30006,30007,30008,30009,30010,30011,30012,30013,30014,30015,30016,30017,30018,30019,
30020,30021,30022,30023,30024,30025,30026,30027,30028,30029,30030,30031,30032,30033,30034,30035,30036,30037,30038,30039,
30050,30051,30052,30053,30054,30055,30056,30057,30058,30059,30060,30061,30062,30063,30064,30065,30066,30067,30068,30069,
30070,30071,30072,30073,30074,30075,30076,30077,30078,30079,31000,31001,31002,31003,31004,31005,31006,31007,31008,31009,
31010,31011,31012,31013,31014,31015,31016,31018,31019,31020,31021,31022,31023,31024,31100,31101,31102,31103,31104,31105,
31106,31107,31108,31109,31110,31111,31112,31113,31114,31115,31116,31117,31118,31119,31200,31201,31202,31203,31204,31205,
31206,31207,31208,31209,31210,31211,31212,31213,31214,31215,31216,31217,31218,31219,31220,31221,31222,31223,31224,31225,
31226,31227,31228,31229,31230,31231,31232,31233,31234,31235,31236,31237,31238,31239,31240,31241,31242,31243,31244,31245,
31246,31247,31248,31249,31250,31251,31252,31253,31254,31255,32000,32001,32002,32003,32004,32005,32006,32007,32008,32009,
32010,32011,32012,32013,32014,32015,32016,32017,32018,32019,32020,32021,32022,32023,32024,32025,32026,32027,32028,32029,
32030,32031,32032,32040,32041,32042,32043,32044,32045,32046,32047,32048,32049,32050,50000,50001,50003,50004,50005,50006,
50007,50008,50009,50010,50011,50012,50013,50014,50015,50016,50017,50018,50019,50020,50021,50022,50023,50024,50025,50026,
50027,50028,50029,50030,50031,50032,50033,50034,50035,50036,50037,50038,50039,50040,50041,50042,50043,50044,50045,50046,
50047,50048,50049,50050,50051,50052,50053,50054,50055,50056,50057,50058,50060,50061,50062,50063,50064,50065,50066,50067,
50068,50070,50071,50072,50073,50074,50075,50076,50077,50078,50079,50080,50081,50082,50083,50084,50085,50086,50087,50088,
50089,50091,50092,50093,50094,50095,50096,50097,50098,50099,50100,50101,50102,50103,50104,50105,50106,50107,50108,50109,
50110,50111,50112,50113,50114,50115,50116,50117,50118,50119,50120,50121,50123,50125,50126,50127,50128,50129,50130,50131,
50132,50133,50134,50135,50136,50137,50138,50139,50140,50141,50142,50143]