... ? "MQTTClient_setCallbacks", nResult Vt_Aviso("Erro ao criar modo multithread. " + lZA_Zero( nResult, 10, .F. ) ,.T.) quit Return( Nil ) Endif cTopicLen := "cTopicLen" nResult := DllCall( MQTTLIB, DLL_OSAPI, "MQTTClient_receive", nHandle, cClientID, ...