Method for bidirectional transfer of information to carry out a configuration and/or a parameterization and/or a pairing of a home automation system from a mobile device, said home automation system comprising at least two products (A, B), said mobile device comprising a microcontroller and a memory; said mobile device being able to perform a configuration and/or a parameterization of at least said two products (A, B) and being able to pair at least one of the at least two products (A, B) with at least one other of the at least two products (A, B) and comprising a nearfield communication chip reader such as an NFC chip reader and a memory, each of the products (A, B) comprising a nearfield communication chip such as an NFC chip and a memory containing at least one item of information, method characterized in that it comprises, for each product (A, B) concerned, to be configured and/or parameterized and/or paired, and from one such reader capable of communicating bidirectionally with each chip, the following successive steps: a) offering up the mobile device to at least two chips; and, b) each chip offered up, establishing a bidirectional nearfield communication link between the reader and the corresponding chip to be able, by choice, to carry out the following steps: i) either transmitting a new item of information, created using the microcontroller, from the mobile device to the chip, ii) or transmitting an item of information, stored in the memory of the product (A, B), from the chip thereof to the reader, then transmitting, from the reader to the chip, via the bidirectional nearfield communication link, a new item of information, created from the mobile device as a function or on the basis of at least one of the items of information transmitted by the products (A, B), then in storing the new item of information in the memory of the product (A, B) concerned. a) offering up the mobile device to at least two chips; and, b) each chip offered up, establishing a bidirectional nearfield communication link between the reader and the corresponding chip to be able, by choice, to carry out the following steps: i) either transmitting a new item of information, created using the microcontroller, from the mobile device to the chip, ii) or transmitting an item of information, stored in the memory of the product (A, B), from the chip thereof to the reader, then transmitting, from the reader to the chip, via the bidirectional nearfield communication link, a new item of information, created from the mobile device as a function or on the basis of at least one of the items of information transmitted by the products (A, B), then in storing the new item of information in the memory of the product (A, B) concerned. i) either transmitting a new item of information, created using the microcontroller, from the mobile device to the chip, ii) or transmitting an item of information, stored in the memory of the product (A, B), from the chip thereof to the reader, then transmitting, from the reader to the chip, via the bidirectional nearfield communication link, a new item of information, created from the mobile device as a function or on the basis of at least one of the items of information transmitted by the products (A, B), then in storing the new item of information in the memory of the product (A, B) concerned.