Hi Riaanhar,

I disagree, the problems encountered are because of poor designs.
The cellular network works on the same principle, just at a higher power output, and there are millions of cellphones connected to the network.
The problem is that the manner in which systems are presented today, in modular form, means that anyone with a little bit of knowledge is able to put a system together, it does not necessarily mean that it is going to work well. It is not the hardware, but the software. There has to be checks and balances, and all communications require a handshake to ensure that the data was successfully transferred, if not then the data must be reset. The true engineer no longer can compete, because of the low entry level, what then happens is that the technology is thrashed by the user because of the so called lack of performance, because of poor design techniques.

There are many networks which are used in meter reading for instance that work on this principle, and there are thousands of meters in the field, which successfully communicate.

There is another solution, you can use a mains modem.
Do a Google search, you will find a number of manufacturers.