WiFi

The log says associated, but the device still cannot send application data. In Wi-Fi, the problem is usually that the security stage has not finished. scan -> authentication -> association only attaches the terminal to a BSS (Basic Service Set). What makes the data plane usable is the key-establishment and key-installation process that follows.

Wi-Fi security ties together password mode, handshake flow, management-frame protection, and compatibility.

The core of Wi-Fi security is establishing a verifiable link, installing keys, and enabling the data plane after basic access is complete.

Where It Sits in the Access Path

In the most common STA -> AP flow, the security stage comes after association and before the data plane:

The device log already says connected, but the application traffic still does not work. The problem is usually not one “connected” state. It is that 802.11 access, security setup, DHCP, DNS, and application connectivity have all been mixed into one step.

Treating “saw the AP,” “associated,” “keys installed,” “got an IP,” and “the service works” as the same state is one of the most common mistakes in Wi-Fi access. For embedded implementation, packet analysis, and debugging, these states have different observation points. If they are mixed together, the logs lose their diagnostic value.