The client's socket instance
The primary Socket.IO server instance
The security hash used to validate arrival
The student's unique ID
The time of arrival in UNIX format
The ID of the lecture
Shared reference to global lecture data
Shared reference to students not yet present in each lecture
Shared reference to currently present students in each lecture
Map tracking used IPs for each lecture
Handles the event where a student arrives to a lecture with a given security hash.
Throws
If validation fails or insertion fails