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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...更多）等图片格式的扩展
通信
【MQTT】UrsPahoMqttClient 拓展：轻量级物联网传输协议
【TCP客户端】 ClientSocketAI2Ext 拓展：TCP/IP传输协议
【UDP】 UrsAI2UDP 拓展 - UDP广播通信协议
【蓝牙】BlueToothLE 拓展：低功...
App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...更多）等图片格式的扩展
通信
【MQTT】UrsPahoMqttClient 拓展：轻量级物联网传输协议
【TCP客户端】 ClientSocketAI2Ext 拓展：TCP/IP传输协议
【UDP】 UrsAI2UDP 拓展 - UDP广播通信协议
【蓝牙】BlueToothLE 拓展：低功...
java.net.ConnectException: Connection refused
...
I had the same problem with Mqtt broker called vernemq.but solved it by adding the following.
$ sudo vmq-admin listener show
to show the list o allowed ips and ports for vernemq
$ sudo vmq-admin listener start port=1885 -a 0.0.0.0 --mountpoint /ap...
What is ActiveMQ used for - can we apply messaging concept using a Database?
...eatures that are only in ActiveMQ, wire protocols like OpenWire, STOMP and MQTT, JMS, EIP together with Apache Camel, message patterns like "request/reply" and "publish/subscribe", JMS Bridging, clustering ("network of brokers"), which allow scaling and distributions, etc.
You should read up on thos...