[PATCH] BugID:21031319: Increase the recvmbox size for UDP so it wouldn't miss DTLS certificate messages.
#define TCPIP_MBOX_SIZE 60
#define DEFAULT_ACCEPTMBOX_SIZE 10
#define DEFAULT_RAW_RECVMBOX_SIZE 10
-#define DEFAULT_UDP_RECVMBOX_SIZE 10
+#define DEFAULT_UDP_RECVMBOX_SIZE 20
#define DEFAULT_TCP_RECVMBOX_SIZE 10
#define LWIP_TCPIP_CORE_LOCKING 1
