QNET introduces the official website link:
QNET Weak Network Test-Network Test Tool-Tencent WeTest QNET does not need ROOT/jailbreak mobile phones, no need to connect data cables, and provides users with fast, reliable and fully functional solutions in the form of an independent app. Weak network simulation service 
https://wetest.qq.com/product/qnet
- Function : QNET has a very useful function - TCP/UDP network protocol packet capture , which helps developers and testers to analyze network traffic, without ROOT phone, use tcpdump to capture packets.
- Login: QNET supports mobile QQ account or TAPD account of Tencent employees to log in. If you use QQ account to log in for the first time, you need to register WeTest platform account to log in successfully.
- Select the test APP: After successfully logging in, click the [Click to select the test program] button, select the weak network tool to be tested, and then click the [Start Test] button below. When starting for the first time, you need to authorize the permission of the floating window, some The model will pop up a confirmation box to enable the VPN service, click OK.
- Weak network template: QNET supports system preset templates and user-defined templates. The preset templates include common 2G/3G/4G network templates, and 100% packet loss templates commonly used in weak network tests. The preset templates It does not support editing, but can be deleted; in addition, QNET supports users to customize weak network parameter templates according to their own testing requirements, which has better flexibility.
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Floating window
After starting the test, QNET will automatically pull up the program to be tested, and then display the floating window of weak network template control and the floating window of weak network template information by default. The left floating window is the control floating window, which can be pulled down to switch the weak network template immediately, double-click the Q button to switch back to the QNET application, and click the pause button to stop the weak network state and restore the normal network; the right floating window displays the current template name, real-time delay, Real-time network speed, as well as the specific parameters of the current template. Note: QNET supports dynamic detection of the delay of the current network and remote server, and then dynamically adapts the uplink and downlink delays set by the user to ensure that the real network delay is as consistent as possible with the user's settings.
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Continuous packet loss can realize the weak network scenario of periodic network disconnection. It is often used to test the fluency of the game and verify the game's support for network fluctuations. TCP/UDP protocol control (Protocol) supports weak network control for protocols. For example, we can control 100% packet loss of UDP protocol to test weak network scenarios of some operators that do not support UDP protocol.
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Network capture
QNET also supports network capture, exporting it as a Pcap file, which can be opened and analyzed on a PC with Wireshark tool, currently supports TCP, UDP, DNS protocols
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To use the network packet capture function, you need to turn on the switch:
Note: This article is transferred from: QNET, a powerful APP weak network testing tool - QuarkZ - 博客园