Bon j’ai trouvé:
log MQTT2:
[2024-07-30 19:35:23][DEBUG] : Message reçu sans prise en charge par un plugin : {"espresense":{"rooms":{"salon":{"status":"offline","max_distance":16,"absorption":3.5,"tx_ref_rssi":-59,"rx_adj_rssi":0,"arduino_ota":"OFF","auto_update":"OFF","prerelease":"OFF","switch":"OFF","button":"OFF","pir_timeout":0.5,"radar_timeout":0.5,"switch_1_timeout":0.5,"switch_2_timeout":0.5,"button_1_timeout":0.5,"button_2_timeout":0.5,"led_1":{"state":"OFF"}}},"settings":{"iBeacon:e5ca1ade-f007-ba11-0000-000000000000-44-18317":{"config":{"id":"node:salon","name":"Salon"}}}}}
[2024-07-30 19:35:23][DEBUG] : Message reçu sans prise en charge par un plugin : {"theengs":{"local":{"LWT":"online"}}}
[2024-07-30 19:35:23][DEBUG] : Message reçu sans prise en charge par un plugin : {"homeassistant":{"sensor":{"C47C8D661208-lux":{"config":{"stat_t":"+\/+\/BTtoMQTT\/C47C8D661208","dev_cla":"illuminance","unit_of_meas":"lx","state_class":"measurement","name":"HHCCJCY01HHCC-lux","uniq_id":"C47C8D661208-lux","val_tpl":"{{ value_json.lux | is_defined
log de mon plugin:
[2024-07-30 19:35:23][INFO] : Début d'activation du plugin
[2024-07-30 19:35:24][INFO] : Info sur le démon : {"launchable_message":"","launchable":"nok","state":"nok","log":"nok","auto":0}
[2024-07-30 19:35:24][DEBUG] : Lancement de : /var/www/html/core/class/../../core/php/jeePlugin.php plugin_id=MQTTinfo function=install callInstallFunction=1
[2024-07-30 19:35:47][INFO] : Lancement démon
[2024-07-30 19:35:47][INFO] : Démon MQTTinfo lancé
[2024-07-30 19:35:47][DEBUG] : handle Mqtt Message:{"theengs":{"local":{"BTtoMQTT":{"5CC1D7613726":{"manufacturerdata":"7500420401806e5cc1d76137265ec1d761372501e3a600000000","id":"5C:C1:D7:61:37:26","rssi":-92,"mfr":"Samsung Electronics Co. Ltd."}}}}}
[2024-07-30 19:35:48][DEBUG] : handle Mqtt Message:{"theengs":{"local":{"BTtoMQTT":{"A4C138CBA207":{"name":"ATC_PARENT","id":"A4:C1:38:CB:A2:07","rssi":-75,"brand":"Xiaomi","model":"TH Sensor","model_id":"LYWSD03MMC\/MJWSD05MMC_ATC","type":"THB","tempc":26.2,"tempf":79.16,"hum":65,"batt":100,"volt":2.91,"mac":"A4:C1:38:CB:A2:07"},"C47C8D661208":{"name":"Flower care","id":"C4:7C:8D:66:12:08","rssi":-85,"brand":"Xiaomi\/VegTrug","model":"MiFlora","model_id":"HHCCJCY01HHCC","type":"PLANT","lux":2142,"mac":"C4:7C:8D:66:12:08"}}}}}
Le message theengs/tgw_local/LWT=online arrive avant le démarrage de mon plugin qui s’abonne à ce topic via mqtt2::addPluginTopic, donc c’est MQTT2 qui recoit ce message et pas moi 
Il me transfére les messages suivants mais c’est trop tard…
Du coup je ne sais pas comment m’en sortir? Des idées?