Communication system, communication device, and method for reconnecting communication system

A communication device comprising:

• a first wireless communication circuit functioning as a wireless relay device of a network;
• a second wireless communication circuit functioning as a slave unit to be connected to another communication device in the network;
• a processor;
• a storage configured to store system information including connection information for connection to the first wireless communication circuit of the other communication device constituting the network;
• and
• a memory having stored thereon instructions executable by the processor to cause the communication device to perform:
• when the second wireless communication circuit is disconnected from the first wireless communication circuit of a higher-level communication device being connected thereto, searching for another communication device constituting the network using the system information and making reconnection to the other communication device detected by the search.

A method for reconnecting a communication system, a plurality of communication devices being connected so as to constitute a network;

• each of the plurality of communication devices comprising a first wireless communication circuit functioning as a wireless relay device of the network and a second wireless communication circuit functioning as a slave unit to be connected to another communication device in the network;
• the second wireless communication circuit of a lower-level communication device accesses the first wireless communication circuit of a higher-level communication device, whereby the higher-level communication device and the lower-level communication device are connected so as to constitute the network;
• and each of the plurality of communication devices stores system information including connection information for connection to the first wireless communication circuit of each communication device constituting the network, wherein:
• when any one of the plurality of communication devices is disconnected from the higher-level communication device being connected thereto, the disconnected communication device searches for another communication device constituting the network using the system information and makes reconnection to the communication device detected by the search.