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-/*

- Background Radiation Monitor - Web Server

- 

- A simple web server that makes available to clients over the Internet

- readings from a MightyOhm Geiger counter. The MightyOhm is connected to

- an Arduino Uno with attached Ethernet shield.  This software module

- runs on the Arduino Uno an embedded HTTP server by which Internet

- applications can query the MightyOhm for Geiger counter readings.

- Also, this software runs a Network Time Protocol (NTP) client, that

- periodically synchronizes the local system clock to network time.

- Included is a simple command line interface that may be used to change the

- network interface IP address, NTP server address, or configure a

- verbose output mode.

- 

- Copyright 2014 Jeff Owrey

-    This program is free software: you can redistribute it and/or modify

-    it under the terms of the GNU General Public License as published by

-    the Free Software Foundation, either version 3 of the License, or

-    (at your option) any later version.

-

-    This program is distributed in the hope that it will be useful,

-    but WITHOUT ANY WARRANTY; without even the implied warranty of

-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-    GNU General Public License for more details.

-

-    You should have received a copy of the GNU General Public License

-    along with this program.  If not, see http://www.gnu.org/license.

- 

- Circuit:

- * Main components: Arduino Uno, Ethernet shield, Mighty Ohm Geiger counter

- * Ethernet shield attached to pins 10, 11, 12, 13

- * In order to allow the MightyOhm to operate on the Uno's 5 volt power

-   supply, and thus make the MightyOhm's serial output compatible with the

-   Uno, the following has to be done (see MightyOhm schematic):

-     1. Change R6 to 1K Ohm.

-     2. Change R11 to 330 Ohm.

-     3. Connect +5v from the Uno to MightyOhm J6 pin 1.

-     4. Connect GND from the Uno to MightyOhm J6 pin 3.

-     5. Connect D5 from the Uno to MightyOhm J7 pin 5.

-   

- Misc Notes:

-   As of this release the Uno's SRAM gets entirely maxed out by

-   this program.  Any modifications to this program that requires

-   additional memory seriously entails the risk that the modifications

-   will cause the program to become un-stable.

-   

- Revision History:  

-   * v10 released 25 Feb 2014 by J L Owrey

-   * v11 released 24 Jun 2014 by J L Owrey

-       - optimization of processRxByte function to conserve SRAM

-       - removal of non-used function code

-       - defaults to APIPA IP address in the event a DHCP address

-         cannot be obtained

-   * v12 released 20 Dec 2014 by J L Owrey

-       - removed Timestamp global variable to make more dynamic

-         memory available for local variables

-       - optimized clock network synch algorithm

-       - optimized serial update algorithm

-   * v13 released 22 Jul 2015 by J L Owrey

-       - add use of "F" function to store constant strings in

-         program flash memory in order to save SRAM space

-   * v14 released 19 Aug 2015 by J L Owrey

-       - add ability to respond to web a client request with either

-         a JSON compatible string or a standard HTML document

-*/

-

-/***  PREPROCESSOR DEFINES  ***/

-

-/*

- Define the header and version number displayed at startup

- and also by the 'view settings' command.

-*/

-#define STARTUP_HEADER "\n\rRadmon v1.4 (c) 2015"

-#define RADMON_VERSION "v1.4"

-/*

- The following define sets the MAC address of the device.  This

- address is a permanent attribute of the device's Ethernet interface,

- and never, ever, should be changed.  This address was provided

- by the Arduino Ethernet shield manufacturer for use with this

- specific instance of the Ethernet shield.  This MAC address should

- be shown on a label affixed to the device housing.

-*/

-#define ETHERNET_MAC_ADDRESS 0x90, 0xA2, 0xDA, 0x0D, 0x84, 0xF6

-/*