Method for the initial commissioning of a data acquisition device (S), a data concentrator and/or a sensor for a consumer (V) with the inclusion of an operator (B), a service provider (D), a head-end system (HE) and an initialization server (IS), wherein the head-end system (HE) is assigned to the operator (B) and the initialization server (IS) is assigned to the service provider (D), wherein an initialization app (IA) is provided and is made available to the consumer (V) by the operator (B) and/or the service provider (D), wherein the following method steps are carried out: A.0) when the initialization app (IA) is started by the consumer (V), the initialization app (IA) is authenticated on the initialization server (IS); A) the consumer (V) connects to the initialization server (IS) via the initialization app (IA); B) the consumer (V) uses the initialization app (IA) to carry out a local search for the data acquisition device (S) to be commissioned; B.1) after the data acquisition device (S) has been found, it is selected for registration; B.2) the data acquisition device (S) transmits its public key to the initialization app (IA); C.1) the initialization app (IA) sends a registration request containing the public key of the data acquisition device (S) to the initialization server (IS) ; D) the initialization server (IS) creates a registration token for the data acquisition device (S); D.1) the initialization server (IS) encrypts the created registration token using the public key of the data acquisition device (S); E) the initialization server (IS) transfers the registration token to the initialization app (IA); F) the initialization app (IA) transfers the registration token to the data acquisition device (S); G.0) the data acquisition device (S) decrypts the encrypted registration token using its private key; G) the data acquisition device (S) registers with the head-end system (HE) by means of the registration token. an operator (B), a service provider (D), a head-end system (HE) and an initialization server (IS), A.0) when the initialization app (IA) is started by the consumer (V), the initialization app (IA) is authenticated on the initialization server (IS); A) the consumer (V) connects to the initialization server (IS) via the initialization app (IA); B) the consumer (V) uses the initialization app (IA) to carry out a local search for the data acquisition device (S) to be commissioned; B.1) after the data acquisition device (S) has been found, it is selected for registration; B.2) the data acquisition device (S) transmits its public key to the initialization app (IA); C.1) the initialization app (IA) sends a registration request containing the public key of the data acquisition device (S) to the initialization server (IS) ; D) the initialization server (IS) creates a registration token for the data acquisition device (S); D.1) the initialization server (IS) encrypts the created registration token using the public key of the data acquisition device (S); E) the initialization server (IS) transfers the registration token to the initialization app (IA); F) the initialization app (IA) transfers the registration token to the data acquisition device (S); G.0) the data acquisition device (S) decrypts the encrypted registration token using its private key; G) the data acquisition device (S) registers with the head-end system (HE) by means of the registration token. <EOS>