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The first script example shows how to switch between SIM slots in case mobile roaming is detected for LtAP mini devices. This could be useful for mobile vehicle applications, where cars, buses or trains could drive abroad and should use two SIM cards (one for a home network, other for a roaming network). Since RouterOS has a roaming status for in the info command LTE monitor (displayed only when roaming) we can use this in RouterOS scripts to change SIM cards accordingly.

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{
# Setup and read current values, "up" SIM slot will be used for roaming, "down" for home network
:global simSlot [/system routerboard sim get sim-slot]
:global timeoutLTE 60
:global timeoutConnect 60

# Wait for LTE to initialize for maximum "timeoutLTE" seconds
:local i 0
:local isLTEinit false
:while ($i<$timeoutLTE) do={
    :foreach n in=[/interface lte find] do={:set $isLTEinit true}
    :if ($isLTEinit=true) do={
        :set $i $timeoutLTE
    }
    :set $i ($i+1)
    :delay 1s
}

# Check if LTE is initialized, or try power-reset the modem
:if ($isLTEinit=true) do={
    # Wait for LTE interface to connect to mobile network for maximum "timeoutConnet" seconds
    :local isConnected false
    :set $i 0
    :while ($i<$timeoutConnect) do={
        :if ([/interface lte get [find name="lte1"] running]=true) do={
            :set $isConnected true
            :set $i $timeoutConnect
        }
        :set $i ($i+1)
        :delay 1s
    }
    # Check if LTE is connected
    if ($isConnected=true) do={
        :local Info [/interface lte infomonitor lte1 once as-value]
        :local isRoaming ($Info->"roaming")
        # Check which SIM slot is used
        :if ($simSlot="down") do={
            # If "down" (home) slot, check roaming status
            :if ($isRoaming=true) do={
                :log info message="Roaming detected, switching to SIM UP (Roaming)"
                /system routerboard sim set sim-slot=up
            }
        } else={
            # Else "up" (roaming) slot, check roaming status
            :if (!$isRoaming=true) do={
                :log info message="Not roaming, switching to SIM DOWN (Home)"
                /interface lte settings set sim-slot=down
            }
        }
    } else={
        :log info message="LTE interface did not connect to network, wait for next scheduler"
    }
} else={
    :log info message="LTE modem did not appear, trying power-reset"
    /system routerboard usb power-reset duration=5s
}
}

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