Qt Signal-Slot Connections: Establishing Communication between Objects

These lines of code establish signal-slot connections between the `msocket` object and the `ProtocolRequest` object. \n\nThe first line connects the `connected` signal of the `msocket` object to the `connect_suc` slot of the `ProtocolRequest` object. This means that when the `msocket` object emits the `connected` signal (indicating that a connection to a remote server has been successfully established), the `connect_suc` slot of the `ProtocolRequest` object will be called.\n\nThe second line connects the `readyRead` signal of the `msocket` object to the `read_reply` slot of the `ProtocolRequest` object. This means that when the `msocket` object emits the `readyRead` signal (indicating that new data is available for reading), the `read_reply` slot of the `ProtocolRequest` object will be called.\n\nThe third line connects the `timeout` signal of the `mtimer` object to the `auto_connect` slot of the `ProtocolRequest` object. This means that when the `mtimer` object emits the `timeout` signal (indicating that the specified time interval has elapsed), the `auto_connect` slot of the `ProtocolRequest` object will be called.