Wireless communication has become an invisible bridge in the Internet of Things connection, en 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, Slaaf, 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 deze modus, you can search for surrounding devices and select the slave devices that need to be connected for connection. In theorie, waarmee één Bluetooth-masterapparaat kan communiceren 7 Bluetooth-slave-apparaten tegelijkertijd. A device with Bluetooth communication function can switch between the two roles. Het werkt meestal in de slave-modus en wacht tot andere master-apparaten verbinding maken. When needed, het schakelt over naar de mastermodus en initieert oproepen naar andere apparaten. When a Bluetooth device initiates a call in the main mode, het moet het Bluetooth-adres van de andere partij kennen, wachtwoord koppelen, en andere informatie. Nadat het koppelen is voltooid, het gesprek kan direct worden gestart.

FSC-BT616 TI CC2640R2F BLE 5.0 Module

Slave device mode: The Bluetooth module working in slave mode can only be searched by the host, en er kan niet actief naar worden gezocht. Nadat het slave-apparaat is verbonden met de host, het kan ook gegevens verzenden en ontvangen met het hostapparaat.

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