cleaned up compiler warnings

bacnet-stack/demo/handler/dlenv.c

@@ -176,8 +176,7 @@ void dlenv_maintenance_timer(
             BBMD_Timer_Seconds -= elapsed_seconds;
         }
         if (BBMD_Timer_Seconds == 0) {
-            int retval;
-            retval = dlenv_register_as_foreign_device();
+            (void)dlenv_register_as_foreign_device();
             /* If that failed (negative), maybe just a network issue.
              * If nothing happened (0), may be un/misconfigured.
              * Set up to try again later in all cases. */

bacnet-stack/demo/handler/h_get_alarm_sum.c

@@ -150,6 +150,13 @@ void handler_get_alarm_summary(
     bytes_sent =
         datalink_send_pdu(src, &npdu_data, &Handler_Transmit_Buffer[0],
         pdu_len);
+#if PRINT_ENABLED
+    if (bytes_sent <= 0) {
+        fprintf(stderr, "Failed to send PDU (%s)!\n", strerror(errno));
+    }
+#else
+    bytes_sent = bytes_sent;
+#endif
 
     return;
 }

bacnet-stack/demo/handler/h_iam.c

@@ -99,8 +99,10 @@ void handler_i_am_bind(
     len =
         iam_decode_service_request(service_request, &device_id, &max_apdu,
         &segmentation, &vendor_id);
-    /* only add address if requested to bind */
-    address_add_binding(device_id, max_apdu, src);
+    if (len > 0) {
+        /* only add address if requested to bind */
+        address_add_binding(device_id, max_apdu, src);
+    }
 
     return;
 }

bacnet-stack/demo/handler/h_ts.c

@@ -66,11 +66,14 @@ void handler_timesync(
     len =
         timesync_decode_service_request(service_request, service_len, &bdate,
         &btime);
+    if (len > 0) {
 #if PRINT_ENABLED
-    fprintf(stderr, "Received TimeSyncronization Request\r\n");
-    show_bacnet_date_time(&bdate, &btime);
+        fprintf(stderr, "Received TimeSyncronization Request\r\n");
+        show_bacnet_date_time(&bdate, &btime);
+#else
+        /* FIXME: set the time? */
 #endif
-    /* FIXME: set the time? */
+    }
 
     return;
 }
@@ -89,11 +92,13 @@ void handler_timesync_utc(
     len =
         timesync_decode_service_request(service_request, service_len, &bdate,
         &btime);
+    if (len > 0) {
 #if PRINT_ENABLED
-    fprintf(stderr, "Received TimeSyncronization Request\r\n");
-    show_bacnet_date_time(&bdate, &btime);
+        fprintf(stderr, "Received TimeSyncronization Request\r\n");
+        show_bacnet_date_time(&bdate, &btime);
 #endif
-    /* FIXME: set the time? */
+        /* FIXME: set the time? */
+    }
 
     return;
 }

bacnet-stack/demo/handler/h_wpm.c

@@ -203,4 +203,11 @@ void handler_write_property_multiple(
     bytes_sent =
         datalink_send_pdu(src, &npdu_data, &Handler_Transmit_Buffer[0],
         pdu_len);
+#if PRINT_ENABLED
+    if (bytes_sent <= 0) {
+        fprintf(stderr, "Failed to send PDU (%s)!\n", strerror(errno));
+    }
+#else
+    bytes_sent = bytes_sent;
+#endif
 }

bacnet-stack/demo/handler/s_rp.c

@@ -69,7 +69,6 @@ uint8_t Send_Read_Property_Request_Address(
 {
     BACNET_ADDRESS my_address;
     uint8_t invoke_id = 0;
-    bool status = false;
     int len = 0;
     int pdu_len = 0;
     int bytes_sent = 0;