Signal transmission device, signal transmission method, and signal transmission system

A signal transmission method comprising:

• rewriting communication control information stored in a signal transmission device with rewrite information received by contactless communication;
• generating power in accordance with a surrounding environment;
• and
• sending a signal using the generated power on a basis of the communication control information.

A signal transmission system comprising:

• a signal transmission device including
• a power generation unit configured to generate power in accordance with a surrounding environment,
• a first communication unit configured to send a signal using the power generated by the power generation unit,
• a storage unit configured to store communication control information for controlling the first communication unit,
• a communication control unit configured to control the first communication unit on a basis of the communication control information, and
• a contactless communication unit configured to receive rewrite information for rewriting the communication control information stored in the storage unit by contactless communication;
• and
• a signal relay device including
• a relay communication unit configured to receive the signal sent from the first communication unit of the signal transmission device, and
• a second communication unit configured to wirelessly transmit the received signal.