Abstract: A method of wireless audio transmission and playback includes steps of: a) dividing, by a host, the audio data into audio segments; b) transmitting, by the host, the audio segments to each of audio playback devices; c) transmitting to the host, by each of the audio playback devices, with respect to each of the audio segments received thereby, an acknowledgment indicating that the audio playback device has received the audio segment; and d) when determining, by the host based on the acknowledgment(s) thus received, that at least one of the audio playback devices has received a first specific audio segment, controlling all of the audio playback devices having received the first audio segment to play the first audio segment synchronously with each other.

Abstract: A method for controlling an electronic device includes steps of: designating one of IoT devices as a master device, and the other IoT devices as slave devices; determining whether the slave device is connectable to the master device; connecting to the master device if affirmative; otherwise, connecting to at least one of the other slave devices which is not yet communicably connected to the slave device, so that at a signal transmission path exists between the master device and each slave device; receiving an operation control signal, and transmitting the same to the master device; and transmitting by the master device the operation control signal to a specific one of the IoT devices for controlling the electronic device.