Java
javaTutorial
How to solve the problem of username and password authentication failure when connecting to local EMQX using Eclipse Paho?
How to solve the problem of username and password authentication failure when connecting to local EMQX using Eclipse Paho?
Eclipse Paho MQTTAsyncClient connection to local EMQX username password authentication solution
This document explains the solution to the problem of failing username and password authentication when connecting to local EMQX MQTT Broker using Java and Eclipse Paho's MQTTAsyncClient library.
Problem description
When using the org.eclipse.paho.client.mqttv3 library to connect to local EMQX (configured for built-in database password authentication, password encryption is plain, salt-disabled), the connection will still fail and MqttSecurityException: 错误的用户名或密码exception is thrown. The MQTTX client test connection was successful. The Java code is as follows:
String brokerUrl = "tcp://127.0.0.1:1883";
MqttAsyncClient mqttClient = new MqttAsyncClient(brokerUrl, "test");
MqttConnectOptions connOpts = new MqttConnectOptions();
connOpts.setUserName("emqx_test");
connOpts.setPassword("emqx_test_password".toCharArray());
connOpts.setServerURIs(new String[] { brokerUrl });
connOpts.setCleanSession(true);
mqttClient.connect(connOpts, connStatus); // The problem lies The callback function onFailure returns reason_code_failed_authentication error code. When EMQX's built-in database authentication is disabled, the connection is successful, but the EMQX console shows that the username is missing.
Solution
The problem is the line of code mqttClient.connect(connOpts, connStatus); In order to correctly authenticate username and password, it needs to be modified to:
mqttClient.connect(connOpts, null, connStatus);
Setting the second parameter null can solve the authentication failure problem. After modification, the connection is successful and the username authentication takes effect.
Through the above adjustments, the user name and password authentication failure can be solved when the Eclipse Paho MQTTAsyncClient is connected to local EMQX.
The above is the detailed content of How to solve the problem of username and password authentication failure when connecting to local EMQX using Eclipse Paho?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1670
14
1428
52
1329
25
1274
29
1256
24
Steps to add and delete fields to MySQL tables
Apr 29, 2025 pm 04:15 PM
In MySQL, add fields using ALTERTABLEtable_nameADDCOLUMNnew_columnVARCHAR(255)AFTERexisting_column, delete fields using ALTERTABLEtable_nameDROPCOLUMNcolumn_to_drop. When adding fields, you need to specify a location to optimize query performance and data structure; before deleting fields, you need to confirm that the operation is irreversible; modifying table structure using online DDL, backup data, test environment, and low-load time periods is performance optimization and best practice.
Top 10 digital currency trading platforms: Top 10 safe and reliable digital currency exchanges
Apr 30, 2025 pm 04:30 PM
The top 10 digital virtual currency trading platforms are: 1. Binance, 2. OKX, 3. Coinbase, 4. Kraken, 5. Huobi Global, 6. Bitfinex, 7. KuCoin, 8. Gemini, 9. Bitstamp, 10. Bittrex. These platforms all provide high security and a variety of trading options, suitable for different user needs.
Quantitative Exchange Ranking 2025 Top 10 Recommendations for Digital Currency Quantitative Trading APPs
Apr 30, 2025 pm 07:24 PM
The built-in quantization tools on the exchange include: 1. Binance: Provides Binance Futures quantitative module, low handling fees, and supports AI-assisted transactions. 2. OKX (Ouyi): Supports multi-account management and intelligent order routing, and provides institutional-level risk control. The independent quantitative strategy platforms include: 3. 3Commas: drag-and-drop strategy generator, suitable for multi-platform hedging arbitrage. 4. Quadency: Professional-level algorithm strategy library, supporting customized risk thresholds. 5. Pionex: Built-in 16 preset strategy, low transaction fee. Vertical domain tools include: 6. Cryptohopper: cloud-based quantitative platform, supporting 150 technical indicators. 7. Bitsgap:
How does deepseek official website achieve the effect of penetrating mouse scroll event?
Apr 30, 2025 pm 03:21 PM
How to achieve the effect of mouse scrolling event penetration? When we browse the web, we often encounter some special interaction designs. For example, on deepseek official website, �...
How to use MySQL functions for data processing and calculation
Apr 29, 2025 pm 04:21 PM
MySQL functions can be used for data processing and calculation. 1. Basic usage includes string processing, date calculation and mathematical operations. 2. Advanced usage involves combining multiple functions to implement complex operations. 3. Performance optimization requires avoiding the use of functions in the WHERE clause and using GROUPBY and temporary tables.
An efficient way to batch insert data in MySQL
Apr 29, 2025 pm 04:18 PM
Efficient methods for batch inserting data in MySQL include: 1. Using INSERTINTO...VALUES syntax, 2. Using LOADDATAINFILE command, 3. Using transaction processing, 4. Adjust batch size, 5. Disable indexing, 6. Using INSERTIGNORE or INSERT...ONDUPLICATEKEYUPDATE, these methods can significantly improve database operation efficiency.
Easeprotocol.com directly implements ISO 20022 message standard as a blockchain smart contract
Apr 30, 2025 pm 05:06 PM
This groundbreaking development will enable financial institutions to leverage the globally recognized ISO20022 standard to automate banking processes across different blockchain ecosystems. The Ease protocol is an enterprise-level blockchain platform designed to promote widespread adoption through easy-to-use methods. It announced today that it has successfully integrated the ISO20022 messaging standard and directly incorporated it into blockchain smart contracts. This development will enable financial institutions to easily automate banking processes in different blockchain ecosystems using the globally recognized ISO20022 standard, which is replacing the Swift messaging system. These features will be tried soon on "EaseTestnet". EaseProtocolArchitectDou
How to analyze the execution plan of MySQL query
Apr 29, 2025 pm 04:12 PM
Use the EXPLAIN command to analyze the execution plan of MySQL queries. 1. The EXPLAIN command displays the execution plan of the query to help find performance bottlenecks. 2. The execution plan includes fields such as id, select_type, table, type, possible_keys, key, key_len, ref, rows and Extra. 3. According to the execution plan, you can optimize queries by adding indexes, avoiding full table scans, optimizing JOIN operations, and using overlay indexes.
