Check if new handshake after a dropped connection chages the `c2d_port`

# Research
**We know** that we get the `c2d_port` (by which we talk to the drone and send commands) from the Handshake response.

However we are **not sure** if the drone will **randomly assign a new port(?)** after a **new Handshake**, if the **connection has dropped**.

# Please check: Is this the case?

No files, tests, or entry points are named. Locate the handshake response handling and connection-recovery flow in the repository, then determine whether a new handshake after a dropped connection can return a different c2d_port; document the observed behavior and add a focused test if the existing test setup supports it.

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