XDR_Dictionary.cfg

// This program uses libconfig 
// https://www.hyperrealm.com/libconfig/libconfig_manual.html
// See the link above for more info on the libconfig and config files. 
// This program only reads the settings below

// This program uses Tinyexpr for the algebraic expression engine
// https://github.com/codeplea/tinyexpr


// The program accepts input XDR strings (line by line) references this dictionary file and generates a corresponding 
// output Signal K Delta message based on the input and a defined Signal K path.


// XDR messages can contain information relating to multiple sensors:
// Each sensor's information is contained in quadruplets
// example xdr messages
//$IIXDR,C,28.7,C,ENV_OUTSIDE_T,P,101400,P,ENV_ATMOS_P,H,47.38,P,ENV_OUTSIDE_H*32
//$IIXDR,C,,C,ENV_WATER_T,C,28.69,C,ENV_OUTAIR_T,P,101400,P,ENV_ATMOS_P*69
//$IIXDR,C,28.69,C,ENV_OUTSIDE_T,P,101400,P,ENV_ATMOS_P,H,47.38,P,ENV_OUTSIDE_H*0A
//$IIXDR,H,47.38,P,ENV_OUTSIDE_H*30
//$IIXDR,P,101400,P,ENV_ATMOS_P*03


// XDR source data - Source TCP server definition
TCP_in_address = "mplex.local";
TCP_in_port = 10300;

//Program offers a TCP server for output
TCP_out_address = "127.0.0.1";
TCP_out_port = 10250;

mmsi = "601270800"

// The XDR fields are defined with type, data, and units describing the contents of the input message
// The name field must match the field in the XDR message. This is used to reference both the sk_path and expression definitions
// The sk_path definition is used in the output Signal K delta message
// The expression field must contain a valid alegraic expression with x refering to the data contained in the input XDR data field.
// The expression field is used to convert the input data to the SI units required by Signal K. For example a conversion from 
// Celcius to Kelvin has the expression (x+273.15)
// In Signal K volumes are reduced to percentage of full so dividing liters by the volume of the tank is done e.g. (x/225)


XDR_Dictionary =
{
  sensors =	( 
//			{type = "Water temperature";
//			data = "temperature";
//			units = "float";		//can be int, float or radians 0, 2 or 4 decimal places in output data
//			name = "ENV_WATER_T";
//			expression = "(x+273.15)"
//			sk_path ="environment.water.temperature" },

			{type = "Air temperature";
			data = "temperature";
			units = "float";
			name = "ENV_OUTAIR_T";
			expression = "(x+273.15)";
			sk_path ="environment.outside.temperature" },

			{type = "WaterLevel";
			data = "volume";
			units = "float";
			name = "WATER#0"; 
			expression = "(x/225)" 
			sk_path ="tanks.freshWater.0.currentLevel" },

			{type = "FuelLevel";
			data = "volume";
			units = "float";
			name = "FUEL#0";
			expression = "(x/300)";
			sk_path ="tanks.fuel.0.currentLevel" },

			{type = "Outside temperature"
			data = "temperature";
			units = "float";
			name = "ENV_OUTSIDE_T"; 
			expression = "(x+273.15)";
			sk_path ="environment.outside.temperature" },

			{type = "Outside pressure";
			data = "pressure";
			units = "int";
			name = "ENV_ATMOS_P";
			expression = "(x*1)";
			sk_path ="environment.outside.pressure" },

			{type = "Outside humidity";
			data = "humidity";
			units = "float";
			name = "ENV_OUTSIDE_H";
			expression = "(x*1)";
			sk_path = "environment.outside.humidity" },

			{type = "Vessel attitude";  // "Vessel attitude" is treated special ...
			data = "Vessel attitude";
			units = "radians";
			name = "ROLL"
			expression = "(x*3.1415926/180)";
			sk_path = "navigation.attitude"},

			{type = "Vessel attitude";
			data = "Vessel attitude";
			units = "radians";
			name = "PTCH"
			expression = "(x*3.1415926/180)";
			sk_path = "navigation.attitude"}
		);
};