Wireless communication has become an invisible bridge in the Internet of Things connection, y Bluetooth, as a mainstream wireless communication technology, plays a vital role in the Internet of Things application. we receive inquiries from customers about the Bluetooth module sometimes, but during the communication process, I found that some engineers are still vague about the concept of the Bluetooth module as the master and slave, but we have a strong curiosity about technology, how can we tolerate the existence of such knowledge What about blind spots?

BLE peripheral “Slave”

Generally we call BLE Center “Master mode”, call BLE peripheral “Slave”.

BLE has the following roles: Advertiser, Scanner, Esclavo, Master, and Initiator, where the master is converted by the initiator and the scanner On the other hand, the slave device is converted by the broadcaster; Bluetooth module communication refers to the communication between two Bluetooth modules or Bluetooth devices. The two parties for data communication are the master and the slave

Master device mode: It works in master device mode and can connect with a slave device. In this mode, you can search for surrounding devices and select the slave devices that need to be connected for connection. En teoría, Un dispositivo maestro Bluetooth puede comunicarse con 7 Dispositivos de esclavos Bluetooth al mismo tiempo. A device with Bluetooth communication function can switch between the two roles. Por lo general, funciona en modo esclavo y espera a que otros dispositivos maestros se conecten. When needed, Cambia al modo maestro e inicia llamadas a otros dispositivos. When a Bluetooth device initiates a call in the main mode, necesita saber la dirección Bluetooth de la otra parte, contraseña de emparejamiento, y otra información. Después de que el emparejamiento esté completo, la llamada se puede iniciar directamente.

FSC-BT616 TI CC2640R2F BLE 5.0 Módulo

Slave device mode: The Bluetooth module working in slave mode can only be searched by the host, and cannot be actively searched. After the slave device is connected to the host, it can also send and receive data with the host device.

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