Disclosed is a communication method implemented in a home-automation system for a building including communicating elements including home-automation and network equipment, the communicating elements being connected to an unconfigured communication network, each communicating element utilizing a predefined communication protocol, and having physical and network addresses including a network prefix cut up into a plurality of addressing fields, at least one of which is not filled. The method includes steps, implemented by a first home-automation equipment item, of: receiving a message including a compressed header containing a first destination network address indication field and a second indication field indicating a fully compressed source network address; obtaining based on the header, without decompression of the source network address and/or of the destination network address, a recipient network element identified, and determining whether the first home-automation equipment item is the recipient; and processing the message as a function of the determination result.