I have experimented with embedded ethernet controllers namely the
pic-maxi for hobby use.

There is now a work project that requires 2 remotely connected (approx
20km wifi link that is in place) devices that needs to control and
status pumps and level inputs.

Basically the A end will comprise a water tank and a pump.  The B end
will comprises a water tank gravity fed from tank A with a level
detector.

When the B tank is low it will signal the A end to start the pump and
stop when the A tank is full.  Then A tank slowly drains into to tank
B.

The A end also needs to provide low battery volts, low oil alarm and
fail to start alarm signal to the B end so it can signal these alarms
for maintenance.  Both ends are solar/battery powered.

Therefore each embedded controller need to be able to act as a client
and server to the other end.  Most embedded ethernet controllers act
as a server allowing a user to login and monitor and control devices
that are locally connected to the controller as when as respond to
input locally and control the devices locally.

I have experimented with the pic-maxi as a client sending http
requests to a server but I dont trust my code or designs for
industrial use and it would take me a very long time to integrate.

Therefore I am seeking off the shelf controllers that anyone has used
successfully and would recommend that could be configured to perform
these functions.

Cheers Justin
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