蓝光BLE在收到Bluno甲虫的几个数据包后断开连接

Question

我需要连接6头黑甲虫到我的拉皮3B+同时接收一些数据。然而，只有一个连接到一个钝甲虫，我已经有持续断开后，收到几个包。有时我能够在断开之前接收到20个数据包，而有时我能够在断开之前收到5个数据包。接收到的数据包数量波动。

这算正常吗？

我的raspi 3B+安装在Raspbian /Linux10 (buster)中。我已经安装了带有BlueepyVersion1.3.0的python3。

Beetle是一个基于Arduino Uno的基于蓝牙4.0的板，Raspi 3B+有一个蓝牙HCI版本: 5.0 (0x9)

我试图通过重新连接来处理断开，它工作得很好。但是重新连接所需的时间需要一段时间(4-5秒)，这将是我从Bluno甲虫侧得到的数据。

如何进一步增强BLE的健壮性？这是我下面的python代码，我只听Beetle发送的数据。

from bluepy import btle
from bluepy.btle import BTLEException, Scanner, BTLEDisconnectError
import threading

# Global Vars
connectionObjects = []      # Total of 6 Connections expected
connectedThreads = []       # Total of 6 Connections expected

threads = list()

class MyDelegate(btle. DefaultDelegate):
    def __init__(self, connection_index):
        btle.DefaultDelegate.__init__(self)

    def handleNotification(self, cHandle, data):
        print("handling notification...")
        data_string = str(data)
        print(data_string)

class ConnectionHandlerThread (threading.Thread):

    def __init__(self, connection_index, BTAddress):
        threading.Thread.__init__(self)
        self.connection_index = connection_index
        self.BTAddress = BTAddress
        self.connection = connectionObjects[self.connection_index]

    def connect(self):
        self.connection.setDelegate(MyDelegate(self.connection_index))

    def run(self):
        self.connect()
        while True:
            try:
                if self.connection.waitForNotifications(1.0):
                    continue
                print("Waiting...")
            except:
                try:
                    self.connection.disconnect()
                except:
                    pass
                finally:
                    reestablish_connection(self.connection, self.BTAddress, self.connection_index)

def reestablish_connection (connection, BTAddr, index):
    while True:
        try:
            print("trying to reconnect with " + str(BTAddr) )
            connection.connect(str(BTAddr))
            print("re-connected to "+ str(BTAddr) +", index = " + str(index))
            return
        except:
            continue

BTAddress = ['1c:ba:8c:1d:3a:c1']

for index in range(len(BTAddress)):
    while True:
        try:
            p = btle.Peripheral()
            p.connect(BTAddress[index], btle.ADDR_TYPE_PUBLIC)
            break
        except btle.BTLEException as e:
            print("Connection Fail. Retrying now...")
            continue

    print ("Successful Connection to BLE " + str(BTAddress[index]))
    connectionObjects.append(p) # first index is 0, first connected is beetle num 1
    thread = ConnectionHandlerThread(len(connectionObjects)-1, BTAddress[index])
    thread.setName("BLE-Thread-" + str(len(connectionObjects)-1))
    thread.start()
    connectedThreads.append(thread)

我的无花果：

hci0:   Type: Primary  Bus: UART
        BD Address: B8:27:EB:D4:EC:5D  ACL MTU: 1021:8  SCO MTU: 64:1
        UP RUNNING
        RX bytes:204543 acl:2383 sco:0 events:8342 errors:0
        TX bytes:49523 acl:152 sco:0 commands:4072 errors:0

通过蓝牙连接似乎很好：

root@raspberrypi:~# bluetoothctl
Agent registered
[bluetooth]# connect 1c:ba:8c:1d:3a:c1
Attempting to connect to 1c:ba:8c:1d:3a:c1
[CHG] Device 1C:BA:8C:1D:3A:C1 Connected: yes
Connection successful

我一直在网络上搜索一个健壮的解决方案，但没有找到防止断开连接或增加重新连接时间的方法。如果你能帮我这个忙，我会很感激的！

其原因是否是RPI firmaware使BLE不稳定？？https://github.com/IanHarvey/bluepy/issues/396

Answer 1

我可以得出结论，RPI固件在与另一个板进行测试后有问题。

的原因是否是RPI使BLE不稳定？？https://github.com/IanHarvey/bluepy/issues/396

在测试Ubuntu18.04仿生运行的Ultra96 v2的相同设置时，不需要断开连接。我每隔1ms就能读/写一次bluno设备，而且连接是健壮的。

因此，似乎问题在于RPI固件。我用的是Raspberry pi 3b+的Rasbian。