PlatformException (PlatformException(read_characteristic_error, unknown reason, may occur if readCha

flutter_blue插件调用characteristic.read方法报错
Exception has occurred.
PlatformException (PlatformException(read_characteristic_error, unknown reason, may occur if readCharacteristic was called before last read finished., null))

解决办法

1. 在read之前判断有没有read权限

if(characteristic.properties.read){
   c.read();   
}

2. 使用listen监听

await characteristic.setNotifyValue(true);
characteristic.value.listen((event) {
   // do
});