(57) Urban remote-surveillance system for street lamps, in which a concentrator module
(1) sends, using a very low power transceiver, by means of a polling procedure, a
message to each of a plurality of remote-control modules (7,8,9,10) equipped with
a very low power transceiver and organized in a hierarchical tree structure, defining
in the message the destination module and a receiving/transmitting path consisting
of a plurality of intermediate modules able to communicate with each other in succession,
at the same frequency and without mutual interference, so as to obtain the necessary
geographical coverage also using very low power transceivers.
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