使用flutter控制蓝牙通讯_Flutter源码-蓝牙操作插件
Obtain an instance
FlutterBlue flutterBlue = FlutterBlue.instance;
Scan for devices
// Start scanning
flutterBlue.startScan(timeout: Duration(seconds: 4));
// Listen to scan results
var subscription = flutterBlue.scanResults.listen((results) {
// do something with scan results
for (ScanResult r in results) {
print(\\'${r.device.name} found! rssi: ${r.rssi}\\');
}
});
// Stop scanning
flutterBlue.stopScan();
Connect to a device
// Connect to the device
await device.connect();
// Disconnect from device
device.disconnect();
Discover services
List services = await device.discoverServices();
services.forEach((service) {
// do something with service
});
Read and write characteristics
// Reads all characteristics
var characteristics = service.characteristics;
for(BluetoothCharacteristic c in characteristics) {
List value = await c.read();
print(value);
}
// Writes to a characteristic
await c.write([0x12, 0x34])
Read and write descriptors
// Reads all descriptors
var descriptors = characteristic.descriptors;
for(BluetoothDescriptor d in descriptors) {
List value = await d.read();
print(value);
}
// Writes to a descriptor
await d.write([0x12, 0x34])
Set notifications and listen to changes
await characteristic.setNotifyValue(true);
characteristic.value.listen((value) {
// do something with new value
});
Read the MTU and request larger size
final mtu = await device.mtu.first;
await device.requestMtu(512);
Note that iOS will not allow requests of MTU size, and will always try to negotiate the highest possible MTU (iOS supports up to MTU size 185)
Reference
FlutterBlue API
Android
iOS
Description
scan
Starts a scan for Bluetooth Low Energy devices.
state
Stream of state changes for the Bluetooth Adapter.
isAvailable
Checks whether the device supports Bluetooth.
isOn
Checks if Bluetooth functionality is turned on.
BluetoothDevice API
Android
iOS
Description
connect
Establishes a connection to the device.
disconnect
Cancels an active or pending connection to the device.
discoverServices
Discovers services offered by the remote device as well as their characteristics and descriptors.
services
Gets a list of services. Requires that discoverServices() has completed.
state
Stream of state changes for the Bluetooth Device.
mtu
Stream of mtu size changes.
requestMtu
Request to change the MTU for the device.
BluetoothCharacteristic API
Android
iOS
Description
read
Retrieves the value of the characteristic.
write
Writes the value of the characteristic.
setNotifyValue
Sets notifications or indications on the characteristic.
value
Stream of characteristic\\'s value when changed.
BluetoothDescriptor API
Android
iOS
Description
read
Retrieves the value of the descriptor.
write
Writes the value of the descriptor.
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