Lightweight Arduino library to read data using the VE.Direct protocol from Victron Energy devices

Built as part of a larger project, now making it available separately in case others find it useful.

Setup:

• An Arduino(ish) board
• A Victron Energy device that sends serial data using the text version of the VE.Direct protocol
• A 5v to 3.3v serial converter (BMV is 3.3v - don't plug it directly into a 5v Arduino!)
• Plugged into the Arduino on a serial port (eg Serial1, Serial2, Serial3 etc)
• See also: https://www.victronenergy.com/live/vedirect_protocol:faq
• Developed and tested with a BMV-700 battery monitor, should work with any that talk VE.Direct
• Distributed under an MIT license - see LICENCE.txt

Provides:

• Read access to VE.Direct statistics and settings
• Defaults set to read Volts, Power, Current, State of Charge (SOC), Alarm
• Easily extendible by adding labels for any other stats and settings of interest
• A diagnostic "full dump" of everything coming from the device

This branch implements SoftwareSerial primarily for ESP8266 boards that need their native USB port for debug purposes.

#include "VEDirect.h"

// Serial pins
#define rxPin D7
#define txPin D8

VEDirect my_bmv(rxPin, txPin);
my_int32 = my_bmv.read(VE_SOC);	

// VE_SOC, VE_VOLTAGE, VE_CURRENT, VE_POWER, VE_ALARM