Explain number of allowed connections

moxerver.h

@@ -13,7 +13,7 @@
 
 /* Global variables used throughout the application. */
 server_t server;	 /* main server */
-client_t client;	 /* connected client */ //TODO working with only 1 client, this can be expanded into a list
+client_t client;	 /* connected client */
 client_t new_client; /* reserved for a new client request */
 tty_t tty_dev;		 /* connected tty device */
 

server.c

@@ -52,8 +52,8 @@ int server_setup(server_t *server, unsigned int port)
 	server->port = port;
 	fprintf(stderr,"[%s] assigned port %u\n", __func__, server->port); // ntohs(server->address.sin_port)
 	
-	/* listen for a client connection, allow some connections in queue */
-	if (listen(server->socket, 1) == -1)
+	/* listen for a client connection, allow (max-1) connections in queue */
+	if (listen(server->socket, (SERVER_MAX_CONNECTIONS - 1)) == -1)
 	{
 		fprintf(stderr, "[%s:%d] error %d: %s\n", __func__, __LINE__,
 				errno, strerror(errno));

server.h

@@ -5,6 +5,10 @@
 #include <common.h>
 #include <client.h>
 
+/* The serial-server scenario makes sense only for 1 connected client.
+ * Allow 1 extra connection to reject new clients with an explanation. */
+#define SERVER_MAX_CONNECTIONS 2
+
 typedef struct
 {
 	int socket;					/* server socket */