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Are there any limitations ( mainly amount of messages) when using free MQTT server ( such as iot.eclipse.org ), that causes from time to time not to publish messages?
I have 2-3 device connected at home, and for testing purposes, publish about 10-20 a day.
The short answer is no (at least for iot.eclipse.org)
But it is worth pointing out that these brokers are made available with absolutely no SLAs. They are there purely to make testing things like new client libraries easier or for somebody to do a quick test of an app to help eliminate a possible problem with a local broker. They can go down at any time for any number of reasons from an update or due to getting hammered by other people "testing".
You really shouldn't be using them for anything you care about in any way, if you are running some home monitoring/automation then you should probably be running your own broker (a raspbery pi will happily run mosquitto servicing many clients) to allow you to secure things properly, ensure that you don't get client id or topic clashes
The latest actual list of public and free MQTT brokers located here. Some of them provides service just for test purposes as hardillb mentioned, some of them provide even SLA for free service. Please read careful each broker information page about terms of use, SLA and limitations they provide.
