How to allow 2 different nodered server which are connected to 2 different wifi router


Are there any solutions or ways to allow two Node-RED servers which are connected to two different WIFI router to communicate with one another? like for example, I have one for house A and another one for house B. How can they communicate?


How about a cloud MQTT broker?


Good idea. I will try it. Because previously i try to use ibm watson platform...quite confusing.


Thanks. Problem solved.haha