Ping-sweep subnet before ARP lookup to find devices not yet in cache

setup_onyx.sh

@@ -74,17 +74,33 @@ detect_ollama_host() {
         return
     fi
 
-    # Get IPs of devices currently visible on the network from the ARP table
+    local LOCAL_IP
+    LOCAL_IP=$(ipconfig getifaddr en0 2>/dev/null || ipconfig getifaddr en1 2>/dev/null || echo "")
+    if [ -z "$LOCAL_IP" ]; then
+        echo "" >&2
+        print_warning "Could not determine local IP address." >&2
+    else
+        local SUBNET
+        SUBNET=$(echo "$LOCAL_IP" | cut -d. -f1-3)
+
+        # Ping-sweep the subnet in parallel to populate the ARP cache,
+        # then read ARP for live hosts and check port 11434 on all of them.
+        echo "" >&2
+        print_warning "Ping-sweeping ${SUBNET}.0/24 to find live devices..." >&2
+        for i in $(seq 1 254); do
+            ping -c1 -W1 "${SUBNET}.${i}" &>/dev/null &
+        done
+        wait
+
         local ARP_IPS
         ARP_IPS=$(arp -a 2>/dev/null | grep -v incomplete | grep -oE '\(([0-9]{1,3}\.){3}[0-9]{1,3}\)' | tr -d '()')
+
         if [ -z "$ARP_IPS" ]; then
-        echo "" >&2
+            print_warning "No live devices found on ${SUBNET}.0/24." >&2
-        print_warning "No devices found in ARP table." >&2
         else
             local COUNT
             COUNT=$(echo "$ARP_IPS" | wc -l | tr -d ' ')
-        echo "" >&2
+            print_warning "Checking $COUNT live devices for Ollama (port 11434)..." >&2
-        print_warning "Scanning $COUNT network devices for Ollama (port 11434)..." >&2
 
             local TMPFILE
             TMPFILE=$(mktemp)
@@ -116,8 +132,8 @@ detect_ollama_host() {
                 return
             fi
 
-        echo "" >&2
+            print_warning "Ollama not found on any live device." >&2
-        print_warning "Ollama not found on any network device." >&2
+        fi
     fi
 
     # Nothing found — ask the user directly