Communication system and device using dynamic receiver addressing

A method for operating a communication device for receiving a message from a communication network, said communication device having continuously available to it locally generated data that varies with time in a non-deterministic manner, the method comprising the steps of:

• downloading into the communication device a signal from the communication network, said signal containing a filter specification, any associated data required by said filter as well as the said message;
• applying said filter according to said specification to said downloaded data as well as to said locally available data;
• and
• using the result of said application of said filter to determine if said communication device is entitled to receive the message contained in said signal.

A method of establishing a connection, via a communication network, between a first communication device and one or more second communication devices, the method comprising the steps of:

• sending from said first communication device a signal containing the message to be communicated and at least one first data value;
• having continuously available to each said second communication device at least one locally generated second data value that is a measure of a local environmental parameter;
• and
• establishing a connection for transfer of said message with at least one second communication device only if a predetermined condition is satisfied between said first data value and said second data value available to said at least one second communication device.

A method of establishing a connection, via a communication network, between a first communication device and one or more second communication devices, the method comprising the steps of:

• sending from said first communication device a signal containing the message to be communicated and specification of a filter and at least one first data value;
• having at least one predetermined second data value locally stored in each said second communication device;
• each of said second communication devices applying said filter to said first data and to said second data per said specification;
• and
• establishing a connection for transfer of said message with at least one second communication device only if said filter operation in said at least one second communication device results in a true condition.