Communication method in a home-automation installation

1. A communication method in a home-automation installation comprising at least one sending element, a self-powered receiving element and an element for substituting for the receiving element, the sending element, the receiving element and the substitution element belonging to one and a same home-automation network such that the receiving element communicates directly with other elements of the home-automation network when the receiving element is active, the method being such that, when the receiving element is in sleep mode, the substitution element executes the following steps:

receiving and recording information sent by the sending element for the attention of the receiving element only after the substitution element has measured a predetermined duration after receipt of a last message received by the substitution element and sent by the receiving element and

confirming to the sending element that the information has been properly received by substituting an identifier of the receiving element for an identifier of the substitution element, and

such that, when the receiving element is no longer in sleep mode, the substitution element executes the following step:

sending the information for the receiving element, wherein the sending element, the receiving element and the substitution element use a same authentication key to recognize the membership of the home-automation network.

2. The communication method as claimed in claim 1 , wherein, when the receiving element is not in sleep mode, the information is transmitted directly between the sending element and the receiving element.

3. The communication method as claimed in claim 1 , wherein the substitution element receives and records information sent by the sending element for the attention of the receiving element only after the substitution element has received a message from the receiving element regarding its entry into a sleep mode.

4. The communication method as claimed in claim 1 , wherein the substitution element is able to substitute itself for several receiving elements.

5. The communication method as claimed in claim 1 , wherein the substitution element is designated from among the elements of the home-automation installation in a prior designation process.

6. The communication method as claimed in claim 1 , wherein the substitution element is determined in a prior designation procedure in which a reception level of a signal sent by the receiving element is measured in elements of the home-automation installation to determine the substitution element.

7. The communication method as claimed in claim 6 , wherein the signal is sent at reduced power by the receiving element.

8. The communication method as claimed in claim 6 , wherein a signal reception sensitivity is reduced in each element of the home-automation installation to determine the substitution element.

9. The communication method as claimed in claim 1 , wherein the substitution element sends the information for the attention of the receiving element by substituting the identifier of the sending element for the identifier of the substitution element.

10. The communication method as claimed in claim 9 , wherein the substitution element is able to substitute itself for several sending elements.

11. A home-automation installation apparatus comprising at least one sending element and a receiving element that is self-powered, the home-automation installation apparatus implementing a communication such that the receiving element communicates directly with other elements of the home-automation installation apparatus when the receiving element is active, the communication being such that, when the receiving element is in sleep mode, a substitution element

receives and records information sent by the sending element for the receiving element only after the submission element has measured a predetermined duration after receipt of a last message received by the substitution element and sent by the receiving element and

confirms to the sending element that the information has been properly received by substituting an identifier of the receiving element for an identifier of the substitution element, and such that, when the receiving element is no longer in sleep mode, the substitution element

sends the information for the receiving element, wherein the sending element, the receiving element and the substitution element use a same authentication key to recognize the membership of the home-automation network installation apparatus.