Method for generating a signal intended to be transmitted through a network of connected objects, said method comprising: - a step of obtaining a first signal conveying a stream of data which are acquired by a connected object of the network, said method being such that it comprises: - a step of receiving a second synchronization signal comprising information providing a dating of the first signal; and - a step of generating a third signal by combining, in a reversible operation, the first signal and the second synchronization signal, said method being characterized in that said reversible operation comprises: - frequency multiplexing the first signal and second signal (S1, S2) over two consecutive frequency bands; or - multiplexing the first signal and second signal (S1, S2) by orthogonal codes; or - steganographically multiplexing the first signal and second signal (S1, S2); or - watermarking, the third signal being obtained by superposing the first signal and second signal, the second signal being a high-spectral-density signal, the first signal being a low-density narrowband signal. - a step of obtaining a first signal conveying a stream of data which are acquired by a connected object of the network, said method being such that it comprises: - a step of receiving a second synchronization signal comprising information providing a dating of the first signal; and - a step of generating a third signal by combining, in a reversible operation, the first signal and the second synchronization signal, said method being characterized in that said reversible operation comprises: - frequency multiplexing the first signal and second signal (S1, S2) over two consecutive frequency bands; or - multiplexing the first signal and second signal (S1, S2) by orthogonal codes; or - steganographically multiplexing the first signal and second signal (S1, S2); or - watermarking, the third signal being obtained by superposing the first signal and second signal, the second signal being a high-spectral-density signal, the first signal being a low-density narrowband signal. - a step of receiving a second synchronization signal comprising information providing a dating of the first signal; and - a step of generating a third signal by combining, in a reversible operation, the first signal and the second synchronization signal, said method being characterized in that said reversible operation comprises: - frequency multiplexing the first signal and second signal (S1, S2) over two consecutive frequency bands; or - multiplexing the first signal and second signal (S1, S2) by orthogonal codes; or - steganographically multiplexing the first signal and second signal (S1, S2); or - watermarking, the third signal being obtained by superposing the first signal and second signal, the second signal being a high-spectral-density signal, the first signal being a low-density narrowband signal. - frequency multiplexing the first signal and second signal (S1, S2) over two consecutive frequency bands; or - multiplexing the first signal and second signal (S1, S2) by orthogonal codes; or - steganographically multiplexing the first signal and second signal (S1, S2); or - watermarking, the third signal being obtained by superposing the first signal and second signal, the second signal being a high-spectral-density signal, the first signal being a low-density narrowband signal.