Fixed Route cost calculation

Mika Tervonen · Mika Tervonen · commit cfd1a4d271e3 · 2020-03-10T08:58:34.000+02:00
If route cost was larger than 0xffff it was calculated incorrectly and
wrapped
diff --git a/source/6LoWPAN/ws/ws_bootstrap.c b/source/6LoWPAN/ws/ws_bootstrap.c
@@ -2645,6 +2645,10 @@ static uint16_t ws_bootstrap_routing_cost_calculate(protocol_interface_info_entr
         //Scale to 128 based ETX (local read retur 0x100 - 0xffff
         etx = etx >> 1;
     }
+    // Make the 0xffff as maximum value
+    if (ws_neighbor->routing_cost + etx > 0xffff) {
+        return 0xffff;
+    }
 
     return ws_neighbor->routing_cost + etx;
 }

Original file line number	Diff line number	Diff line change
`@@ -2645,6 +2645,10 @@ static uint16_t ws_bootstrap_routing_cost_calculate(protocol_interface_info_entr`
`2645`	`2645`	`//Scale to 128 based ETX (local read retur 0x100 - 0xffff`
`2646`	`2646`	`etx = etx >> 1;`
`2647`	`2647`	`}`
	`2648`	`+ // Make the 0xffff as maximum value`
	`2649`	`+ if (ws_neighbor->routing_cost + etx > 0xffff) {`
	`2650`	`+ return 0xffff;`
	`2651`	`+ }`
`2648`	`2652`
`2649`	`2653`	`return ws_neighbor->routing_cost + etx;`
`2650`	`2654`	`}`