Update remove just sleep and add polling to check drcf loaded

[leeminju531]

Problem

In hw_interface, we added a sleep as a workaround to ensure the server is fully loaded.
However, this introduces two side effects:

(a) Unnecessary wait: Even if the server is already loaded, the system still waits for the sleep time.
(b) Potential failure due to resource limitations: In cases of limited resources, users may experience failures if the sleep time is exceeded. (related to #142 (comment))

Proposed Solutions.

1. Use a polling pattern with minimal sleep: This will help address issue (a), as the connection will be attempted at regular intervals with shorter wait times, avoiding unnecessary delays.
2. IExtend the total timeout (from 8 seconds to 30 seconds): This will address issue (b) by providing enough time for the server to load and ensuring that minor performance delays don’t cause failures.