Had insight, that P2P Robot Cloud Control System should operate not on nanoscale but with robots of size of 1 mm3. ('milimetrites', not 'nanites').
It can have ability to reform, not by melting like a poodle of water, but by dispersing & reforming in air, then reconnecting again.
Each of robots has to be flying - for example in magnetic field, communicating wirelessly - for example with xaser communication in magnetic field if possible, and needs ability to connect with others in any way - for example, magnetically. That's the precondition.
It can for example form a Communication Device - for example a Communication Ray that can move & reform as neccessary, and has use for example in a Cave where corridors are not straight - if we do not want to broadcast message in all directions.