Mesh network and gateway?
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 Yep, its the unedited source and the board-defs is the newest downloaded from https://github.com/esp8266/Arduino.git esp8266 The board is the https://www.wemos.cc/product/d1-mini.html The relay actuater code is working fine with my other LoLon esp8266 board, and I get the node and sensors up fine in the mycontroller server. 
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 I am pretty sure, other examples are working with that configuration. I just pulled the most recent version of the code, and got a glimpse of the error message: You are facing this issue with all ESP8266 boards? Or only with https://www.wemos.cc/product/d1-mini.html 
 that too only with recent version? old version works good with https://www.wemos.cc/product/d1-mini.html ?
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 @jkandasa Thanks for getting back to me on this. You are a star! I am only facing the issue on the Wemos D1 mini boards. I have not tried other versions of them, but they suit me really well on their form factor and specs for my project. Everything is working on my other ESP8266 boards, so far I have only tested the example code from the library though. Will dive into a termometer tonight.  
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 @njbuch said: 
 I do not have anyWemos D1 miniwith me. I am testing only with ESP12E and ESP01. Both works great for me.looks like inside Wemos D1 minihas ESP12E module only. Can you give a try with the following board on Arduino IDE for yourWemos D1 mini
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 I have now tried fiddling with different boards, including the NodeMCU 1.0 module. The error is the same, and the board keeps rebooting. 
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 Hi again, tried looking for other solutions, and checked this one: https://github.com/esp8266/Arduino/issues/2414 This guy is having the same problem, but solved it with using a powered HUB, I tried the MycontrollerDevice with some extra juice, and it did not change a thing.  My conclusion is that it writes: "MC[I]: Booting ESP8266 device..." before the exception, there is an illegal pointer operation somewhere in the library.... 
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 @njbuch Can you try some simple sketch without MyControllerDevice and what is the status? 
 No clue yet 
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 @njbuch Are you using Enable auto discovery? If yes, can you disable it and try again? when configuring your device?
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 @njbuch said: My conclusion is that it writes: "MC[I]: Booting ESP8266 device..." before the exception, there is an illegal pointer operation somewhere in the library.... Does this issue resolved on https://github.com/mycontroller-org/MyControllerDevice/issues/5#event-951107065? 
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 Yes it does. Thanks