emq

This is a creation in Article, where the information may have evolved or changed. Attached: It's a kitty. Blog: w-blog.cn EMQ Official Address: http://emqtt.com/ EMQ Chinese Document: http://emqtt.com/docs/v2/guide.html 1.TLS Certificate Validation For security purposes. We often use HTTPS to ensure that requests are not tampered with, as MQTT uses TLS encryption to ensure transport security

Erlang process ConsumptionEMQ a policy that separates client links using the link process (emqtt_client) and session process (emqtt_session). When an MQTT client connects to a EMQ server, a process (emqtt_client) is first established that manages the connection, and when the client is validated, another process (emqtt_session) is established, which is responsible for the client's session.In Emq, each client

]/sysdescr:qos=0Topics for subscribing to a client's top-down lineThe subject of a specific ClientID method for a particular node is:$SYS/brokers/(node)/clients/(clientId)/connected$sys/brokers/[email protected]/clients/861694030142478/ Connected$sys/brokers/[email protected]/clients/861694030142478/disconnectedThe theme of the wildcard method is:$SYS/brokers/+/clients/+/connected$sys/brokers/+/clients/+/disconnected$sys/brokers/+/clients/#For security reasons, we modified the Acl.config file to

From the original author's side of the understanding that the overall can, but do not 99.99% stable. The primary connection memory footprint is not protected.PubSub is stable when it is balanced, but it crashes when a cluster or a large number of messages are released to a few subscriptions, a small probability situation.The CPU in the EMQ is fairly assigned to an MQTT session, a large number of pub messages to a subscription, the subscription does no

Q: Payload transfer process will not be unpacking, sticky bag? Business layer get payload still need to pack?A: No, the MQTT protocol has been agreed, and EMQ will help deal with TCP sticky pack unpacking. In short, just take it out with you.Q: How is payload encrypted?A: Security, if you consider commercial use, it is recommended to tls+ business encryption, double encryption. The TLS private key is basically non-solvable if it is not exposed.Double

This can be done by modifying the configuration file.EMQ v2.3.11, software architecture has been adjusted to integrate functions in the Emq_modules module,/data/loaded_plugins will load emq_modules by default.We just need to change the configuration

width. The default value is 80 n, which can be customized.Set line 100L list the content of the Current BufferN integer. The specified row number in the buffer.C/OLD/NEW Replace the NEW part. If it is not written, it means deletion./Or r runA. The Append content is generally equal to n.Del n deletes the entire row of row n 1. input error correction method 1:Seker> select ename, sal2 from emq3 where sal From emq*ERROR at line 2:ORA-00942: table or vie

protocol, but also very can improve the user experience, such as the MQTT protocol in the reservation message, you can get the phone to boot before the system or other devices have been released some information.Often called message middleware as broker, there are many support Mqtt broker, open source such as Mosquitto based on C language, Erlang emq, rabbitmq+ Plug-ins, Java based ACTIVEMQ, Even based on the Node.js Mosca. I tried it myself. Mosquit

1.gcj-02 coordinate system (Mars coordinates) Introduction: http://blog.csdn.net/giswens/article/details/8775121 (archive: http://mapbd.com/cms/2012/07/25/)Theoretical basis for reverse transformation of 2.gcj-02 to real coordinates: http://blog.csdn.net/giswens/article/details/87752133.WGS84 coordinates with web Mercator coordinates: http://blog.csdn.net/giswens/article/details/96342614. WGS-84-to-GCJ-02 conversion algorithm for streaming: http://kongxz.com/2013/10/wgs-cgj/5. Conversion algorit

1. Effects of REM and emQ. Em?It is a unit of length, relative unit, and the unit of font-size relative to the parent element.If the parent element font-size = 16px, 1em = 16pxQ. What is Rem?It is a unit of length, which is a relative unit. It is a unit of font-size relative to the root element of the document. The root element is generally an HTML element.If the HTML element font-size = 16px, 1rem = 16pxQ. How to use it?As the interface grows, the DI

Turn from:1, http://blog.csdn.net/wildboy2001/article/details/120313512, http://kongxz.com/2013/10/wgs-cgj/3, http://www.oschina.net/code/snippet_260395_39205 GCJ-02 coordinate system (Mars coordinates) Introduction: http://blog.csdn.net/giswens/article/details/8775121 (archive: http://mapbd.com/cms/2012/07/25/) Theoretical basis for reverse transformation of GCJ-02 to real coordinates: http://blog.csdn.net/giswens/article/details/8775213 WGS84 coordinates with web Mercator coordinates:

Ssh:[email Protected]:unbelievableme/object-pool.gitHttps:https://github.com/unbelievableme/object-pool.gitBuffer poolDesign Essentials : Contains three queues: an empty buffer queue (EMQ), an input queue full of input data (INQ), an output queue full of output data (OUTQ), an input program that includes a host input (Hin), an extract input (sin), and an output program that includes a host output (Hout) and extract output (sout).Note : The input progr

of 3 different types of buffers: idle buffers, buffers filled with input data, and buffers filled with output data, managed through 3 queues: Empty buffer queue emq, buffer queue inq filled with input data, buffer queue OUTQ with output data filled. Therefore, the reasonable queue implementation is the basis of the buffer pool management, where the queue template is implemented through an array of scalable capacity. queue.h #pragma once #include 1