Manage a wifi or BT connection to share GSM module with other devices

[reivaxy]

A friend has 3 salt water tanks (and 4 soft water tanks...) and already one of these devices. It would be cool to have extra devices for the other tanks, but that could communicate with the one equipped with the GSM module: less expensive, only one SIM card/subscription...

Random ideas (To be continued)

• each device will need to have a configurable name (and a not configurable ID) to address config messages and identify response messages and alerts. Check if arduino board comes with a usable ID or S/N ?
• Do we want to share the LCD display too ? Optionally ? (saves only about $2, but smaller device, case easier to design...)
• In case an internet connection is available, each device could log all measures (instead of using an sdCard module)

[reivaxy]

Being implemented in branch "wifi"