web: offer to shutdown on SIM swap

It currently times out when generating an IMEI.
I wonder what the timeouts are.

files/usr/libexec/blue-merle

@@ -30,6 +30,11 @@ elif [ "$1" == "random-imei" ]; then
 elif [ "$1" == "shutdown-modem" ]; then
     exec gl_modem AT AT+CFUN=4
 
+elif [ "$1" == "shutdown" ]; then
+    echo '{ "msg": "Shutdowing down..." }' > /dev/ttyS0
+    halt -d 5
+    echo -n "Shutting down"
+
 elif [ "$1" == "write-imei" ]; then
     new_imei=$2
     echo -n  { "action": "write" }

files/www/luci-static/resources/view/blue-merle.js

@@ -771,6 +771,11 @@ function handleConfig(ev)
 	});
 }
 
+function handleShutdown(ev)
+{
+    return callBlueMerle("shutdown")
+}
+
 function handleRemove(ev)
 {
 	var name = ev.target.getAttribute('data-package'),
@@ -849,10 +854,16 @@ function handleSimSwap(ev) {
                     ),
                     E('p', { 'class': 'text'},
                         _("Please shutdown the device and go to another place before booting")
-                    )
+                    ),
+					E('button', { 'class': 'btn cbi-button-positive', 'click': handleShutdown, 'disabled': isReadonlyView }, [ _('Shutdown…') ]), ' ',
                 }
             ).catch(
                 function(err) {
+                    dlg.appendChild(
+                        E('p',{'class': 'error'},
+                            _('Error setting IMEI! ') + err
+                        )
+                    )
                 }
             );
         }