桥接模式下的MQTT Mosquitto无法在Raspberry和Cloud之间传递消息

Question

我正在尝试连接两个Mqtt Broker（Mosquitto）。 我在云服务器上安装了一个，在本地Raspberry Pi上安装了另一个。 Raspeberry Pi Mosquitto应该建立与云实例的连接。 这是我在Raspberry上的配置（/etc/mosquitto/conf.d/bridge.conf）：

connection crowdomat-cloud
address <myserver-hostname>
clientid crowdomat
start_type automatic
cleansession false
notifications true

#
# Send all messages from local /sensor topic to remote /sensor topic
#
topic # both 0 sensor/ sensor/

我可以直接连接到代理和发送和接收消息。 我还看到在日志文件中建立了连接，但是在代理之间没有传递任何消息。

1411577927: mosquitto version 1.3.4 (build date 2014-08-22 06:10:51+0000) starting
1411577927: Config loaded from /etc/mosquitto/mosquitto.conf.
1411577927: Opening ipv4 listen socket on port 1883.
1411577927: Opening ipv6 listen socket on port 1883.
1411577927: Warning: Address family not supported by protocol
1411577927: Bridge crowdomat doing local SUBSCRIBE on topic sensor/#
1411577927: Connecting bridge crowdomat-server (my-server:1883)
1411577927: Bridge crowdomat sending CONNECT
1411577927: Received CONNACK on connection crowdomat.
1411577927: Bridge crowdomat sending SUBSCRIBE (Mid: 466, Topic: sensor/#, QoS: 0)
1411577927: Received PUBACK from crowdomat (Mid: 465)
1411577927: Received SUBACK from crowdomat
1411577986: Sending PINGREQ to crowdomat
1411577986: Received PINGRESP from crowdomat
1411578046: Sending PINGREQ to crowdomat
1411578046: Received PINGRESP from crowdomat
1411578069: Received PUBLISH from crowdomat (d0, q0, r0, m0, '/sensor/data', ... (14 bytes))
1411578106: Sending PINGREQ to crowdomat
1411578106: Received PINGRESP from crowdomat
1411578166: Sending PINGREQ to crowdomat
1411578166: Received PINGRESP from crowdomat
1411578193: mosquitto version 1.3.4 terminating
1411578193: Saving in-memory database to /var/lib/mosquitto/mosquitto.db.

有任何想法吗？

另一个谜团是，只有在击倒Raspberry Pi上的灭蚊过程后，才能看到日志输出。

此外，Mqtt Lens创建的消息：

Answer 1

我以前错过了您的问题。

您的网桥正在订阅sensor/#但是您正在发布到/sensor/data 。 这些主题彼此不匹配。 在/sensor/data的第一个斜杠之前有一个长度为零的层次结构字符串，因此该主题深三个元素： '' ， 'sensor'和'data' 。 ''与您订阅的'sensor'部分不匹配，因此不会发送任何消息。

长话短说，删除/sensor/data中的前导斜线，它应该可以正常工作。

Answer 2

通过将不同的设备桥接到Google CLoud虚拟机，我发现，您需要在devices（local）配置文件中设置协议版本参数。

因此，将bridge_protocol_version版本添加到RPi上的mosquitto.conf文件中，如下所示，用于连接到云的桥连接（这对我有用）：

bridge_protocol_version mqttv311

您还可以像这样在启动时强制在mosquttio上配置文件：

mosquitto -c /etc/mosquitto/conf.d/mosquitto.conf

with mosquitto.conf being the valid configuration file. 

如果您有任何疑问要写，我对mosquitto和mqtt做了很多工作。