Fixed filter to not drop packets when no modification

packet drop check is skipped if no modification for signal quality made.

Author: Mika Tervonen

source/MAC/IEEE802_15_4/mac_filter.c

@@ -343,7 +343,6 @@ int_fast8_t mac_filter_modify_link_quality(int8_t interface_id, mac_pre_parsed_f
         dbm_add = this->dbm_add;
     }
 
-
     //calculate
     int16_t lqi = ( (mac_frame->LQI * lqi_m ) >> 8 ) + lqi_add;
     // Saturate
@@ -368,8 +367,13 @@ int_fast8_t mac_filter_modify_link_quality(int8_t interface_id, mac_pre_parsed_f
 
     tr_debug_extra("mac_filter_modify_link_quality result lqi %d dbm %d",mac_frame->LQI,mac_frame->dbm);
     // If quality goes below treshold packet is dropped
-    if ( ( mac_frame->dbm < MAC_FILTER_SIGNAL_FLOOR ) || ( mac_frame->LQI < 1 )) {
-        tr_debug_extra("Filter dropped packet");
+    if ( (dbm_m != 0x100 || dbm_add != 0) && (mac_frame->dbm < MAC_FILTER_SIGNAL_FLOOR)) {
+        tr_debug_extra("Filter dropped packet signal too low");
+        return 1;
+    }
+
+    if ( (lqi_m != 0x100 || lqi_add != 0) && (mac_frame->LQI < 1)) {
+        tr_debug_extra("Filter dropped packet LQI < 1");
         return 1;
     }
     return 0;