Modified the Wi-SUN stack Latency estimates a bit slower

This will slow the Retry timers for DTLS and CoAP layers
The idea of the estimate is changed a bit to include the
estimation of slowness in backbone. This means that we can
use these values more directly in Retry timer estimations

Thread estimation also slowed
Ethernet estimation also slowed to take into use normal internet slowness
6LoWPAN also estimated to slower

Author: Mika Tervonen

source/6LoWPAN/Bootstraps/Generic/protocol_6lowpan.c

@@ -799,15 +799,15 @@ bool protocol_6lowpan_latency_estimate_get(int8_t interface_id, uint32_t *latenc
 
     if (cur_interface->eth_mac_api) {
         // either PPP or Ethernet interface.
-        latency_estimate = 100;
+        latency_estimate = 1000;
     } else if (thread_info(cur_interface)) {
         // thread network
-        latency_estimate = 2000;
+        latency_estimate = 5000;
     } else if (ws_info(cur_interface)) {
         latency_estimate = ws_common_latency_estimate_get(cur_interface);
     } else {
         // 6LoWPAN ND
-        latency_estimate = 8000;
+        latency_estimate = 20000;
     }
 
     if (latency_estimate != 0) {

source/6LoWPAN/ws/ws_common.c

@@ -486,13 +486,13 @@ uint32_t ws_common_latency_estimate_get(protocol_interface_info_entry_t *cur)
 
     if (network_size <= NETWORK_SIZE_SMALL) {
         // handles also NETWORK_SIZE_CERTIFICATE
-        latency = 4000;
+        latency = 5000;
     } else if (network_size <= NETWORK_SIZE_MEDIUM) {
-        latency = 8000;
+        latency = 10000;
     } else if (network_size <= NETWORK_SIZE_LARGE) {
-        latency = 16000;
+        latency = 20000;
     } else  {
-        latency = 24000;
+        latency = 30000;
     }
 
     return latency;