What's the difference between Bluetooth BLE SPP?

Android Bluetooth protocol is divided into two types, SPP protocol and BLE (Bluetooth? Low? Energy), Android4.3 and above have joined the low-power Bluetooth (BLE Bluetooth Protocol).

2. Different functions.

Bluetooth serial port is a device based on SPP protocol, which can create serial ports between Bluetooth devices for data transmission. The function of Bluetooth serial port is to ensure a complete communication path between applications on two different devices (communication ends).

And BLE(Bluetooth Low Energy) Bluetooth low energy technology is a short-distance, low-cost and interoperable wireless technology, which uses many intelligent means to minimize power consumption.

Extended data:

Bluetooth 4.0 standard includes traditional Bluetooth module and low-power Bluetooth module, which is a dual-mode standard. Low-power Bluetooth is also developed on the basis of traditional Bluetooth, which is different from traditional modules. Its biggest feature is the reduction of cost and power consumption, which requires high real-time application.

Classic Bluetooth devices find other classic Bluetooth devices by calling the startDiscovery () method of BluetoothAdapter, and only classic Bluetooth devices can be found.

In low-power Bluetooth, there is a concept of master device (central) and slave device (peripheral, also called peripheral). As the discoverer, the master device calls the method of discovering the device, which is realized by the startLeScan () method of BluetoothAdapter. As the discovered party, the slave device sends out a broadcast for discovery.

Baidu Encyclopedia-Bluetooth Serial Port