Proposed: New FMI - Networked Device Not Responding

Proposed by Martin Perlot, SilverLeaf Electronics,

New FMI. 21 - Networked Device Not Responding

Justification: Currently there is no unambiguous way for one device to report a failure due to the unresponsiveness of a second networked device. Typically the second device is absent from the network altogether, so it cannot report its own failure.