check_ap.script

# =================================================================
# Script: WiFi AP Connection Check
# RouterOS Version: 7.x
#
# Description: Checks if a WiFi station interface is connected to
# its designated primary Access Point. If it's connected to any
# other AP, it forces a rescan to encourage it to find the
# primary AP again.
#
# Set to run hourly with this command:
# /system scheduler add name="Check_AP_hourly" interval=1h on-event="Check_AP"
# =================================================================

# --- Script Configuration ---
# Set the radio-name of your PREFERRED/PRIMARY access point.
:local primaryRadioName "Mapleleaf-S3/K7WAN"
# Set the name of your WiFi station (client) interface (normally "wlan1").
:local wifiInterface "wlan1"
# --- End of Configuration ---

# Do not edit below this line unless you know what you are doing.

/log info message="AP Check: Starting check for interface '$wifiInterface'."

# This direct method is more robust. It queries the status and radio-name
# separately to avoid issues with variable types from the monitor command.
:local monitorResult [/interface wireless monitor [find name=wlan1] once as-value]
:local currentStatus ($monitorResult->"status")
:local currentRadioName ($monitorResult->"radio-name")

# Check if the interface is actually connected to any access point
if ($currentStatus = "connected-to-ess") do={
    # Now, check if the connected AP is NOT the primary one
    if ($currentRadioName != $primaryRadioName) do={
        /log warning message="AP Check: '$wifiInterface' is connected to non-primary AP ($currentRadioName). Forcing rescan to find $primaryRadioName."

        # Force the interface to scan for other networks
        /interface wireless scan $wifiInterface rounds=1
        :delay 5s
        /ip dhcp-client renew $wifiInterface
    } else={
        /log info message="AP Check: '$wifiInterface' is correctly connected to primary AP ($currentRadioName)."
    }
} else={
    /log info message="AP Check: '$wifiInterface' is not connected (Current Status: $currentStatus)."
}