Do not allow more than 10 NTP requests per second to be served

Signed-off-by: DL6ER <[email protected]>

src/ntp/server.c

@@ -42,6 +42,8 @@
 #include "enums.h"
 // threads
 #include "signals.h"
+// sleepms()
+#include "timers.h"
 
 uint64_t ntp_last_sync = 0u;
 uint32_t ntp_root_delay = 0u;
@@ -269,6 +271,10 @@ static void request_process_loop(const int fd, const char *ipstr, const int prot
 		// Handle the request
 		ntp_reply(fd, &src_addr, src_addrlen, buf, &recv_time);
 		log_debug(DEBUG_NTP, "NTP reply sent");
+
+		// Sleep for 100 msec, this allows no more than 10 requests per
+		// second
+		sleepms(100);
 	}
 }