Refactor code

- Add comments
- Run checkpatch

Signed-off-by: Ayush Singh <ayushdevel1325@gmail.com>

include/mdns.h

@@ -11,12 +11,45 @@
 static const struct in6_addr mdns_addr = {
 	{{0xFF, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFB}}};
 
+/*
+ * Open a new MDNS socket
+ *
+ * @param multicast address
+ *
+ * @return socket if successfull. Else negative
+ */
 int mdns_socket_open_ipv6(const struct in6_addr *saddr);
 
+/*
+ * Close mdns socket
+ *
+ * @param socket
+ */
 void mdns_socket_close(int sock);
 
+/*
+ * Send DNS-SD query over mdns
+ *
+ * @param socket
+ * @param query
+ * @param query length
+ *
+ * @return 0 if successfull. Else negative
+ */
 int mdns_query_send(int sock, const char *name, size_t length);
 
+/*
+ * Receive DNS-SD query response
+ *
+ * @param socket
+ * @param address list to populate with discovered nodes
+ * @param address list length
+ * @param query
+ * @param query length
+ * @param timeout
+ *
+ * @return number of items written to address list
+ */
 size_t mdns_query_recv(int sock, struct in6_addr *addr_list, size_t addr_list_len,
 		       const char *query, size_t query_len, int timeout);
 

include/tcp_discovery.h

+/* SPDX-License-Identifier: Apache-2.0 */
+/*
+ * Copyright (c) 2023 Ayush Singh <ayushdevel1325@gmail.com>
+ */
+
 #ifndef _TCP_DISCOVERY_H_
 #define _TCP_DISCOVERY_H_
 
 #define NODE_DISCOVERY_INTERVAL 5000
 
+/*
+ * Start Greybus Node discovery over network
+ */
 void tcp_discovery_start(void);
 
+/*
+ * Stop Greybus Node discovery over network
+ */
 void tcp_discovery_stop(void);
 
 #endif

src/node.c

@@ -30,7 +30,7 @@ K_HEAP_DEFINE(cports_heap, CONFIG_BEAGLEPLAY_GREYBUS_MAX_CPORTS * sizeof(int));
 
 static sys_dlist_t node_interface_list = SYS_DLIST_STATIC_INIT(&node_interface_list);
 static struct in6_addr node_addr_cache[MAX_GREYBUS_NODES];
-static size_t node_addr_cache_pos = 0;
+static size_t node_addr_cache_pos;
 
 static int ipaddr_cmp(const struct in6_addr *a, const struct in6_addr *b)
 {

src/tcp_discovery.c

+// SPDX-License-Identifier: Apache-2.0
+/*
+ * Copyright (c) 2023 Ayush Singh <ayushdevel1325@gmail.com>
+ */
+
 #include "tcp_discovery.h"
 #include "node.h"
 #include "mdns.h"