Fix variable assignment for speedtest duration tracking

runtest.sh

@@ -184,11 +184,21 @@ 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 $retry"
       speed_results=$(speedtest --secure --csv 2>/dev/null || true)
-      $speedtest_duration=$SECONDS
+      speedtest_duration=$SECONDS
       [[ -n "$speed_results" ]] && break
       warn "Speedtest failed. Retrying in $RETRY_DELAY seconds..."
       echo "$(date -Iseconds),Speedtest failed on attempt $retry for test $COUNTER, sample $i" >> "$FAILURE_LOG"
@@ -199,7 +209,7 @@ for ((COUNTER = 1; COUNTER <= NUM_TESTS; COUNTER++)); do
       timestamp=$(date -Iseconds)
       warn "Speedtest permanently failed. Skipping sample."
       echo "$timestamp,Test $COUNTER,Sample $i" >>"$FAILURE_LOG"
-      $speedtest_duration=$SECONDS
+      speedtest_duration=$SECONDS
       continue
     fi