Initialize duration variables for speed test metrics

runtest.sh

@@ -184,6 +184,16 @@ for ((COUNTER = 1; COUNTER <= NUM_TESTS; COUNTER++)); do
     bssid_and_bitrate=$(iw dev "$INTERFACE" link | awk '/Connected/ {bssid=$3} /tx bitrate/ {tx=$3} /rx bitrate/ {rx=$3} END {print bssid","tx","rx}')
 
     speed_results=""
+    speedtest_duration=0
+    localtcpup_duration=0
+    localtcpdown_duration=0
+    localudpup_duration=0
+    localudpdown_duration=0
+    remotetcpup_duration=0
+    remotetcpdown_duration=0
+    remoteudpup_duration=0
+    remoteudpdown_duration=0
+
     for ((retry = 1; retry <= MAX_RETRIES; retry++)); do
       SECONDS=0
       log "Speed test attempt $retry"