ThingsBoard通过MQTT发送遥测数据

本文主要是介绍ThingsBoard通过MQTT发送遥测数据，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

MQTT基础

客户端

MQTT连接

遥测上传API

案例

MQTT基础

MQTT是一种轻量级的发布-订阅消息传递协议，它可能最适合各种物联网设备。

你可以在此处找到有关MQTT的更多信息，ThingsBoard服务器支持QoS级别0（最多一次）和QoS级别1（至少一次）以及一组预定义主题的MQTT代理。

客户端

你可以在网上找到大量的MQTT客户端库，本文中的示例将基于Mosquitto和MQTT.js您可以使用我们的Hello World指南中的说明。

MQTT连接

我们将在本文中使用令牌凭据对进行设备访问，这些凭证稍后将称为$ACCESS_TOKEN应用程序需要发送用户名包含$ACCESS_TOKEN的MQTT CONNECT消息。

连接状态码说明：

0x00 连接成功 - 成功连接
0x04 连接失败 - 用户名或密码错误。
0x05 连接未授权 - -用户名包含无效的 $ACCESS_TOKEN。

Key-value格式

ThingsBoard支持以JSON格式的key-value字符串值可以是string、bool、float、long或者二进制格式的序列化字符串；

{"stringKey":"value1", "booleanKey":true, "doubleKey":42.0, "longKey":73, "jsonKey": {"someNumber": 42,"someArray": [1,2,3],"someNestedObject": {"key": "value"}}
}

遥测上传API

发布遥测数据到ThingsBoard服务端必须PUBLISH消息发送到下面主题：

v1/devices/me/telemetry

支持的最简单的数据格式是：

{"key1":"value1", "key2":"value2"}

或者

[{"key1":"value1"}, {"key2":"value2"}]

请注意 在这种情况下服务端时间戳将分配给上传的数据!

如果您的设备能够获得客户端时间戳，则可以使用以下格式：

{"ts":1451649600512, "values":{"key1":"value1", "key2":"value2"}}

# Publish client-side attributes update. Replace $THINGSBOARD_HOST_NAME and $ACCESS_TOKEN with corresponding values.
mosquitto_pub -d -h "$THINGSBOARD_HOST_NAME" -t "v1/devices/me/attributes" -u "$ACCESS_TOKEN" -m "{"attribute1": "value1", "attribute2": true}"
# For example, $THINGSBOARD_HOST_NAME reference live demo server, $ACCESS_TOKEN is ABC123:
mosquitto_pub -d -h "demo.thingsboard.io" -t "v1/devices/me/attributes" -u "ABC123" -m "{"attribute1": "value1", "attribute2": true}"# Publish client-side attributes update from file. Replace $THINGSBOARD_HOST_NAME and $ACCESS_TOKEN with corresponding values.
mosquitto_pub -d -h "$THINGSBOARD_HOST_NAME" -t "v1/devices/me/attributes" -u "$ACCESS_TOKEN" -f "new-attributes-values.json"
# For example, $THINGSBOARD_HOST_NAME reference live demo server, $ACCESS_TOKEN is ABC123:
mosquitto_pub -d -h "demo.thingsboard.io" -t "v1/devices/me/attributes" -u "ABC123" -f "new-attributes-values.json"# Publish client-side attributes update from file. Replace $THINGSBOARD_HOST_NAME and $ACCESS_TOKEN with corresponding values.
mosquitto_pub -d -h "$THINGSBOARD_HOST_NAME" -t "v1/devices/me/attributes" -u "$ACCESS_TOKEN" -f "new-attributes-values.json"
# For example, $THINGSBOARD_HOST_NAME reference live demo server, $ACCESS_TOKEN is ABC123:
mosquitto_pub -d -h "demo.thingsboard.io" -t "v1/devices/me/attributes" -u "ABC123" -f "new-attributes-values.json"# Publish client-side attributes update from file. Replace $THINGSBOARD_HOST_NAME and $ACCESS_TOKEN with corresponding values.
mosquitto_pub -d -h "$THINGSBOARD_HOST_NAME" -t "v1/devices/me/attributes" -u "$ACCESS_TOKEN" -f "new-attributes-values.json"
# For example, $THINGSBOARD_HOST_NAME reference live demo server, $ACCESS_TOKEN is ABC123:
mosquitto_pub -d -h "demo.thingsboard.io" -t "v1/devices/me/attributes" -u "ABC123" -f "new-attributes-values.json"

# Publish client-side attributes update. Replace $THINGSBOARD_HOST_NAME and $ACCESS_TOKEN with corresponding values.
cat new-attributes-values.json | mqtt pub -d -h "$THINGSBOARD_HOST_NAME" -t "v1/devices/me/attributes" -u '$ACCESS_TOKEN' -s -m ""
# For example, $THINGSBOARD_HOST_NAME reference live demo server, $ACCESS_TOKEN is ABC123:
cat new-attributes-values.json | mqtt pub -d -h "demo.thingsboard.io" -t "v1/devices/me/attributes" -u 'ABC123' -s -m ""

{"attribute1": "value1","attribute2": true,"attribute3": 42.0,"attribute4": 73,"attribute5": {"someNumber": 42,"someArray": [1,2,3],"someNestedObject": {"key": "value"}}
}