ETX update

Return configured MAX value if etx sampling is not ready but not received any ACK.

Continue probing also after link TX failure.

Author: Juha Heiskanen

source/Service_Libs/etx/etx.c

@@ -269,10 +269,6 @@ void etx_transm_attempts_update(int8_t interface_id, uint8_t attempts, bool succ
         }
 
         etx_calculation(entry, storage->attempts_count, storage->received_acks, &etx_neigh_info);
-
-        if (entry->etx_samples < 7 && !success) {
-            entry->etx_samples = 7; //Stop Probing to failure
-        }
         return;
     }
 
@@ -443,6 +439,11 @@ uint16_t etx_local_etx_read(int8_t interface_id, uint8_t attribute_index)
     }
 
     if (etx_info.cache_sample_requested && entry->etx_samples < etx_info.init_etx_sample_count) {
+        etx_sample_storage_t *storage = etx_info.etx_cache_storage_list + attribute_index;
+        if (storage->received_acks == 0 && storage->attempts_count) {
+            //No ack so return max value
+            return etx_info.max_etx;
+        }
         //Not ready yet
         return 0;
     }