System and device for internet of things

A short-range verifying method, comprising:

• a wireless tag coupling to a reader via a short-range Bluetooth communication, wherein the reader comprises a first MCU, a first Bluetooth module incorporated in the first MCU, and a first resistor coupled to the first Bluetooth module in one end and coupled to a ground in another end;
• and
• when the wireless tag is in a communication range of the short-range Bluetooth communication provided by the first Bluetooth module coupled to the first resistor, the reader verifies an operation by communicating with the wireless tag via the short-range Bluetooth communication,
• wherein the communication range of the short-range Bluetooth communication provided by the first Bluetooth module coupled to the first resistor and the first resistor coupled to the ground is less than 3 centimeters.

A short-range verifying system, comprising:

• a server;
• a communication network;
• a reader, connected with the server, comprising:
• a first MCU;
• a first Bluetooth module, incorporated in the first MCU;
• and
• a first resistor, coupled to the first Bluetooth module in one end and coupled to a ground in another end, and
• a wireless tag, coupled to the reader via a short-range Bluetooth communication to verify a transaction,
• wherein when the wireless tag is in a communication range of the short-range Bluetooth communication provided by the first Bluetooth module coupled to the first resistor, the reader verifies an operation by communicating with the wireless tag via the short-range Bluetooth communication,
• wherein the communication range of the short-range Bluetooth communication provided by the first Bluetooth module coupled to the first resistor and the first resistor coupled to the ground is less than 3 centimeters.