// Event thread for asynchronous received data handling.
// Find or create a socket from the list.
// Callback for Socket Read URC.
// Callback for Socket Read From URC.
// Callback for Socket Close URC.
// Active a connection profile on board the modem.
// Note: the AT interface should be locked before this is called.
// Set up dynamic IP address assignment.
// Activate a profile by reusing an external PDP context.
// Activate a profile by context ID.
// Connect the on board IP stack of the modem.
// Disconnect the on board IP stack of the modem.
// Gain access to us.
// Bind a local port to a socket.
// Send to a socket.
// Send to an IP address.
// Receive from a socket, TCP style.
// Receive a packet over a UDP socket.
// so the overhead is 77 bytes.
// Unsupported TCP server functions.
// Set the authentication scheme.
// Set APN, user name and password.
// Get the IP address of a host.
// Enable or disable SIM PIN check lock.
// Change the PIN code for the SIM card.
// Determine if the connection is up.
// Get the IP address of the on-board modem IP stack.
// Get the local network mask.
// Get the local gateways.
// Callback in case the connection is lost.