Dynamically find wifi network interfaces for wifi_scan

Enhance wifi scan troubleshooter to find all wifi capable devices on the fpp device and then get the AP's that each can see - this replaces a hardcode wlan0

scripts/wifi_scan.sh

@@ -1,20 +1,22 @@
 #!/usr/bin/bash
 
-iwlist wlan0 scanning > /tmp/wifiscan #save scan results to a temp file
-scan_ok=$(grep "wlan" /tmp/wifiscan) #check if the scanning was ok with wlan0
-if [ -z "$scan_ok" ]; then
-    iwlist wlan0-1 scanning > /tmp/wifiscan
-fi
-scan_ok=$(grep "wlan" /tmp/wifiscan) #check if the scanning was ok
+#look for wifi device names on system
+iw dev | awk '$1=="Interface"{print $2}' > /tmp/wifi_devices
+
+cat /tmp/wifi_devices | while read wifi_device || [[ -n $wifi_device ]];
+do
+
+iwlist $wifi_device scanning > /tmp/wifiscan #save scan results to a temp file
+scan_ok=$(grep "$wifi_device" /tmp/wifiscan) #check if the scanning was ok
 if [ -z "$scan_ok" ]; then #if scan was not ok, finish the script
     echo -n "
 WIFI scanning failed.
     
 "
-    exit
+    continue
 fi
 
-connected_address=$(iwconfig wlan0 | sed -n 's/.*Access Point: \([0-9\:A-F]\{17\}\).*/\1/p')
+connected_address=$(iwconfig $wifi_device | sed -n 's/.*Access Point: \([0-9\:A-F]\{17\}\).*/\1/p')
 
 if [ -f /tmp/ssids ]; then
     rm /tmp/ssids
@@ -40,17 +42,17 @@ while [ "$i" -le "$n_results" ]; do
         oneaddress=$(grep " Address:" /tmp/onecell | awk '{print $5}')
         onessid=$(grep "ESSID:" /tmp/onecell | awk '{ sub(/^[ \t]+/, ""); print }' | awk '{gsub("ESSID:", "");print}')
 #               onechannel=$(grep " Channel:" /tmp/onecell | awk '{ sub(/^[ \t]+/, ""); print }' | awk '{gsub("Channel:", "");print}')
-        onefrequency=$(grep " Frequency:" /tmp/onecell | awk '{ sub(/^[ \t]+/, ""); print }' | awk '{gsub("Frequency:", "");print}')
+                onefrequency=$(grep " Frequency:" /tmp/onecell | awk '{ sub(/^[ \t]+/, ""); print }' | awk '{gsub("Frequency:", "");print}')
         oneencryption=$(grep "Encryption key:" /tmp/onecell | awk '{ sub(/^[ \t]+/, ""); print }' | awk '{gsub("Encryption key:on", "(secure)");print}' | awk '{gsub("Encryption key:off", "(open)  ");print}')
         onepower=$(grep "Quality=" /tmp/onecell | awk '{ sub(/^[ \t]+/, ""); print }' | awk '{gsub("Quality=", "");print}' | awk -F '/70' '{print $1}')
         onepower=$(awk -v v3=$onepower 'BEGIN{ print v3 * 10 / 7}')
         onepower=${onepower%.*}
         onepower="(Signal strength: $onepower%)"
-        if [ "$connected_address" == "$oneaddress" ]; then
+                if [ "$connected_address" == "$oneaddress" ]; then
                 currentcon=" - Connected"
-        else
+                else
                 currentcon=""
-        fi
+                fi
         if [ -n "$oneaddress" ]; then                                                                                                            
                 echo "$onessid  $onefrequency $oneaddress $oneencryption $onepower $currentcon" >> /tmp/ssids                                                              
         else                                                                                                                                     
@@ -61,10 +63,14 @@ done
 rm /tmp/onecell
 awk '{printf("%5d : %s\n", NR,$0)}' /tmp/ssids > /tmp/sec_ssids #add numbers at beginning of line
 grep ESSID /tmp/wifiscan | awk '{ sub(/^[ \t]+/, ""); print }' | awk '{printf("%5d : %s\n", NR,$0)}' | awk '{gsub("ESSID:", "");print}' > /tmp/ssids #generate file with only numbers and names
+printf "Wifi Device: $wifi_device\n"
 echo -n "Available WIFI Access Points:
 "
 cat /tmp/sec_ssids #show ssids list
+printf "\n"
 
 rm /tmp/ssids
 rm /tmp/sec_ssids
 rm /tmp/wifiscan
+done
+rm /tmp/wifi_devices