Method and apparatus for connecting devices using bluetooth low-energy technology

A first device for connecting to a second device using Bluetooth low energy (LE), comprising:

• a communication unit for communicating with an outside in a wired or wireless manner;
• and
• a processor functionally connected to the communication unit,
• wherein the processor is configured to,
• receive a first advertising message including first interval information indicating of a transmission interval of an advertising message from the second device,
• adjust a size of a scan window for scanning a surrounding device based on the first advertising message,
• receive a second advertising message from the second device or an external device through the scan window, and
• establish a Bluetooth LE connection with the second device,
• wherein the second advertising message is periodically transmitted according to the transmission interval,
• wherein the first interval information is used to reduce or increase the size of the scan window for receiving the periodically transmitted second advertisement message, and
• wherein the size of the scan window is increased or decreased according to the first interval information.