Same error I got, I was having it connected but not routing properly. It was showing as end device. I found about 3 different parameters suggested, I keep trying different combinations. Getting it paired was very trying. Anyone figure out this error?
you will likely have to first uninstall the Xbee as end device.
Then make sure the settings match the first post and write those settings .
Mainly
AP = API enabled (1)
SM = 0
Then pair the Xbee again to the hub
It should be a router not an end device unless you were trying to do create something as an end device.
Interesting read. I have a Zigbee contact sensor in my mailbox that keeps dropping and hoping a xbee may solve this. Thinking I can put something my my crawl space near a vent in line of sight to my mailbox. I tried an Iris smart plug but it didn’t help.
Knowing nothing about xbee and many many product recommendations in this thread, could someone point me to any documentation on the setup? I don’t mind piecing something together but if there is a single product I can buy even better.
What brand of sensor is in the mailbox? For a single off-the-shelf product, look for a Sylvania Smart+ plug-in outlet. If Xiaomi devices, this will work according to tests by @gavincampbell, but for Xiaomi it must be the non "A" version. Buy from Amazon and return if it's not or find it locally where you can open the box and examine the label are probably your best bets if you are going to extend Xiaomi devices or might do so in the future.
The Iris plugs don't work properly with Xiaomi devices. I wish they did because they do both zigbee and zwave but they gave nothing but problems. I have 3 of them and my devices were constantly dropping when they were plugged in so I had to remove them from the mix.
I have 4 of the Sylvania Smart+ plugs now throughout the house and my setup is solid. I had to strategically place one closer to my sensor in the mailbox and my garage door because those sensors have to go through thicker walls. But they work perfectly. I can only vouch for the non A version as that is all I've tested.
Also take a look at your zigbee channel. If it overlaps with your wifi channel you will also have problems. I have a Eero setup and my zigbee channel is 23. 50+ xiaomi devices have been working perfectly.
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Aren't mailboxes more problematic due to the fact that it's almost a Faraday cage? A lot of door/window contact sensors have terminals inside. You could get a standard wired alarm reed switch and move the Zigbee receiver outside the mailbox too.
Yup. My mailbox is all metal and I have a sensor inside. But on the other side of the wall I have the repeater which also handles everything in my family room/hallway which is just above the corner of my basement where my HE hub is sitting.
The mailbox sensor hasn't dropped off at all. Its been solid. My garage door was always giving me problems so I had to relocate a repeater closer to it and since doing that it's been solid.
I monitor all of my xiaomi devices uses an app I wrote that checks the last checkin time every hour time and it sends me a notification if they haven't checked in after 3 hours. Every now and then I will get a notification but then that device checks in before the next scan.
I have found with this setup, the devices will check in between 1 and 4 hours. Even if they are at the 3 hour mark though they are still functioning. I don't know if its just that the check in signal gets lost and eventually makes it through. But I've had none actually drop off the network.
It was a lot of work to get them this stable but worth it.
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Did you share that? Care to? 
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It’s an Iris contact sensor. It’s mounted underneath versus inside and I have a small magnet on the bottom of the door that moves as the box is opened.
Does the Sylvania plug have a stronger signal?
I plan to move to 20 once I can finally retire my ST hub. My locks are the only thing left as I am waiting on the lock code manager app. But I may move them sooner to try.
Took me a while to find but here's an old webcore script I shared. I have since moved away from webcore but this worked great for a while.
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Did you ever figure this out? Initializing but never completing(ie: able to see save button) when connecting xbee to hubitat
Thanks
Nope. It doesn't show up on my "Devices" list, but it's joined to and routes/repeats for my ZigBee network (I can use XCTU to map it), which is all I really wanted. I suspect if I changed some of the configuration parameters on the module as advised above, I'd be able to get it to show as a device, but I wouldn't really get any use out of that besides seeing that I have one (if I remember correctly, it just shows "inactive" and it's not like you can do anything with it). For these reasons, it hasn't been a priority for me.
If we could make the module more useful and add a lux sensor or temperature/humidity sensor or something, I'd be in more of a hurry. 
I also have a Sylvania Smart+ plug and it works well but the Xbee especially the pro version is far more powerful and will get you much more range. I tested them both with a SmartThing arrival sensor.
With Sylvania it was pretty much right outside the house before they activated, with the Xbee3 pro they activate 4-5 houses away. (of course it's not just how powerful the Xbee is but also how strong the end device is transmitting which would be the limiting factor)
The XB3-24Z8ST with an external RP SMA antenna would be best for your mailbox.
The problem now is being able to find one as they are all on back order.
The surface mount ones are still in stock with a pcb antenna XB3-24Z8RS 1 or a XB3-24Z8US with a U.FL antenna (you will also need a surface mount adapter for these styles) but they would likely be good enough.
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I just received a fedex shipping label creation notice and I see the XB3-24Z8ST are showing available again.
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Last delivery estimate Mouser Canada sent me was December 11. Still shows no inventory on Mouser Canada and US. DigiKey the same. I know there are other US retailers that might have some right now, but I get a really bad deal on shipping cost and often import duty on top of that. So I wait, with a daughter card longing for parent. 
symmetry has it for 28.50, digikey seems overpriced. Picture makes me wonder, but it does say "TH" but shows surface mount in illustration
https://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=73249
Got XB3-24Z8UT-J for 17.50 shipped +tax+shipping = 22.22 to NJ, USA
I'm using this sensor in exactly the same configuration in my mailbox, which is at the street about 100 feet from my hub. What works for me as a repeater is an Osram Zigbee bulb in an enclosed outdoor light fixture just outside my front door, about 80 feet from the mailbox. The contact sensor is the only child device of the bulb (which may be why it has never had any issues acting as a repeater).
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I have 3 different brands usb adapters for the Xbee3
I just received another XB3-24Z8ST with RP SMA antenna and I tried it right from factory with the Ebay Xbee USb adapter and I had some issues since this usb adapter does not have a reset it did not want to load firmware and it appeared to get corrupt when I did try.
Once I reprogrammed it with my other brand usb adapter it appears to work fine with the ebay usb adapter.
I was having an issue even initial pairing the stock Xbee3 with the ebay usb board like others have mentioned that it would just sit initializing. I think it may not write the firmware correctly possible causing corruption.
Also the RP SMA antenna on the XBee3 will touch on the powered header on the usb board which will send 5v to your ground which you do not want to do so you will have to unsolder the header from the usb board. The header is fine with a XB3-24Z8PT (pcb antenna) it will not touch.
I also have a waveshare but this one needs you to install a CP210X driver for windows 10.
It is a bit flaky to work but it does.
The best working one (and more expensive one) is still the digikey Grove USB board part number 602-1979-ND .
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Thank you for the heads up. That $3 card is not worth the trouble then. I will order the correct card. I’m sure I’ll get it before the Xbee 
Question for those with ST and HE setup, how do I use the xbee access point specifically for HE-connected devices?
