No worries thanks for all your help. Im not getting the error now, which is good.
Howver, its not sending onto smartthings. Which means I must be sending the wrong trigger. I tired “arrived”
The trigger is whatever you want it to be. It’s the name that you give to the event when you create the Ifttt applet.
So when you create your applet in Ifttt, you are going to put in the name of that trigger.
And when you type in the webhook in some other app, you are going to include that exact same name in the webhook.
At the documentation link on the Ifttt page, it shows you exactly how to write the name of your webhook
So if you name your event “arrives“ then you just replace {event} with arrives…
They must match exactly. same capitalization, everything. Because when the webhook comes in, that’s how Ifttt will know which applet to run.
That’s all there is to it. Name the event, then put that exact event name into your webhook. 
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Also, I don’t know what you mean by “send on to smartthings”.
In the IFTTT applet, you use the webhooks service as the IF. You will use SmartThings as the THAT and turn on the switch part of your virtual presence sensor.
Smartthings never knows the name of your webhook and doesn’t care. All it knows is that it got a request from Ifttt to turn on a particular switch.
What happens on the SmartThings side when that switch comes on is totally up to whatever automations you’ve created in SmartThings.
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Hi guys, nice work btw!
So my case is a little bit rare i think, i live in the same building were i work, in different floors, so the ST geo presence don´t really know when me or my wife are at home/work because i´m in the same location range. I know now that the ST Arrival sensor dont work very well so i got into this “beacons” thing.
What i understood till now is that i must have a beacon at home to detect when my iPhone approach it (via BT) and then i must have an app to detect the beacon, so that app can communicate with IFTTT and IFTTT communicate with a virtual switch on my ST/Webcore. Did i get it right?
Thanks!
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Yes, that’s the method, except that it is the app on your iPhone that detects when it gets close to the iBeacon. Not the ibeacon detecting the phone. 
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Hum, so the app in my iPhone detects the ibeacon via BT, so i can solve my work/home problem?
Possibly, you can adjust the signal strength of the iBeacon so it’s down to 3 or 4 meters. How far apart are your home and office?
If you need an even smaller distance, you would probably have to go to an NFC tag.
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So my home is in the 17th floor and my office in the 1st. They are in the same GPS position but in different altitude. I really need something more reliable to work with. Something that detects me when i leave the elevator and open my home door. I was thinking about the Wifi conecting - that would be GREAT! But i think its impossible to config in iOS, only in Android. Not even with “Shortcuts”…
So do you think it works in my case? Thanks!
The following does not list specific support for Smartthings but it might be worth looking at.
Intellithings is an occupancy system based on short range sensors, it won’t detect you outside the home. So good for microlocation, but it won’t know you are “arriving” until you enter the first room. That will fit some “presence” use cases, but not others. It’s also quite expensive as it requires a minimum of two of its sensors for a detection event.
This has been an interesting discussion. The advice, analysis, and comment is very informative. I am going to try this myself. I would like to go a step further and add a beacon to the gate post to track people entering/leaving the driveway. Given it is outdoors, are there any rugged versions or other packages of interest?
Estimote beacons work well outdoors, they are primarily designed for commercial use by shopping centers, sports stadiums, etc. so as long as they are in a semi sheltered location, they are usually fine. 
If it’s for a gate post, you might need to place it inside a plastic box or beneath a plastic shelf.
I’m sure there will be other similar brands in the UK, I’m just not sure what they are.
PROBLEM WITH GEOFENCY
Very interesting discussions here 
I have been trying to use Geofency with Webhooks to detect door approach and who is in the car. Geofency seems to work for almost a day, and then i get stuck. I have to reset alle the app permissions to get it going again. I have approached Geofency, but now answer so far. Anyone else having the same experiency? Any good options to Geofency?
I use geofency and have not had those issues.
I know there were some problems with background tracking in IOS 13, here is the fix for those:
I don’t know if the problems persisted with IOS 14. Not very many people have reported them publicly since May.
The geofency developer put out a new update a few days ago. I would try updating both iOS and app and if you still have the issue, try the fix above.
Most of the iBeacon apps had this same issue with background processing in iOS 13 and suggested the same fix.
Thank you so much for the update and the tick I am running latest version of iOS and the app. I also experienced myself that resetting the app priveliges helped - but only for a short day or so. I will try rest of the trick as well. For me it does not only apply to background updates. Even if I open the app, the beacon status is not updated.
Good that is working well for you still
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2021 Update
Estimote now only sells their IBeacons for large bulk orders. However, you can use any iBeacon that meets the Apple standard for the process described above.
Bluecharm is a popular brand for retail sales. They don’t have a full programming platform like estimote does, but they’ll still work with A standard Ibeacon reader. They have both indoor and outdoor models, so check the product descriptions to make sure you’re getting what you need.
US indoor:
I know they also sell in the UK, but I don’t have a link for a supplier.
If you’re looking for either a USB plug-in IBeacon or you are OK with the battery powered IBeacon where you can’t replace the battery, then radius networks is a well-known reliable manufacturer. You can find their products at Amazon or on their own site. They even have a wearable with a wristband. I have used some of theirs in the past and liked everything except the fact that the battery is not replaceable. They also have a USB plug-in model.
US Amazon:
.
The radius network platform is now called “flybuy“ so the following is the manufacturer site. Contact them for UK shipping.
DFRobot also has one which is available from Mouser in either the US or the UK, but I don’t know anything about that one.
https://www.mouser.co.uk/new/dfrobot/dfrobot-ibeacon-ble-modules/
Also, as I’ve mentioned before I don’t usually shop at eBay, but it is pretty easy to find estimote beacons on eBay for shipment to both the US and the UK.
Remember when looking at individual models that the Eddystone protocol was discontinued by Google, so don’t get one that only does that. It’s OK if it does Eddystone and the apple standard as long as the reviews indicate that it works well for the Apple standard.