Mbb_Clients = {};
Mbb_Susbscribers = [];
function Mbb_SubscribeToDeviceStatus(callback)
{
Mbb_Susbscribers.push(callback);
}
function Mbb_Connected(client_id)
{
Log(client_id + " connected!");
Mbb_Clients[client_id] = {};
}
function Mbb_Disconnected(client_id)
{
Log(client_id + " disconnected!");
for (var n = 0; n < Mbb_Susbscribers.length; n++)
{
Mbb_Susbscribers[n]("disconnected", Mbb_Clients[client_id]);
}
delete Mbb_Clients[client_id];
}
function Mbb_ReceivedData(client_id, data)
{
Log(data);
var json_data = eval("(" + data + ")");
//Log(JSON.stringify(json_data));
if (json_data.method == "MBB.GpsNmeaData")
{
if (json_data.params.nmea.substr(0, 6) == "$GPGGA")
{
Mbb_Clients[client_id]["LastNmea"]["GGA"] = json_data.params.nmea;
}
else if (json_data.params.nmea.substr(0, 6) == "$GPRMC")
{
Mbb_Clients[client_id]["LastNmea"]["RMC"] = json_data.params.nmea;
Mbb_Clients[client_id]["Position"] = _Mbb_NmeaToPosition(client_id);
for (var n = 0; n < Mbb_Susbscribers.length; n++)
{
Mbb_Susbscribers[n]("position", Mbb_Clients[client_id]);
}
Mbb_Clients[client_id]["LastNmea"]["GGA"] = "";
Mbb_Clients[client_id]["LastNmea"]["RMC"] = "";
Mbb_Clients[client_id]["Position"] = false;
}
}
else /*if (json_data.method == "MBB.Connected")*/
{
json_data = { "params" : { "Imei" : "004401700721448" } };
Log("Client " + client_id + " has IMEI " + json_data.params.Imei);
Mbb_Clients[client_id]["Id"] = client_id;
Mbb_Clients[client_id]["Info"] = json_data.params;
Mbb_Clients[client_id]["Position"] = false;
Mbb_Clients[client_id]["LastNmea"] = {};
Mbb_Clients[client_id]["LastNmea"]["GGA"] = "";
Mbb_Clients[client_id]["LastNmea"]["RMC"] = "";
for (var n = 0; n < Mbb_Susbscribers.length; n++)
{
Mbb_Susbscribers[n]("connected", Mbb_Clients[client_id]);
}
}
/*else
{
Log("Got unknown data \"" + json_data + "\" from client " + client_id);
}*/
}
function Mbb_SendData(client_id, json_data)
{
return MbbExport_SendData(client_id, JSON.Stringify(json_data));
}
function _Mbb_NmeaToPosition(client_id)
{
/*
GGA Global Positioning System Fix Data
* 123519 Fix taken at 12:35:19 UTC
* 4807.038,N Latitude 48 deg 07.038' N
* 01131.000,E Longitude 11 deg 31.000' E
1 Fix quality: 0 = invalid
1 = GPS fix (SPS)
2 = DGPS fix
3 = PPS fix
4 = Real Time Kinematic
5 = Float RTK
6 = estimated (dead reckoning) (2.3 feature)
7 = Manual input mode
8 = Simulation mode
* 08 Number of satellites being tracked
* 0.9 Horizontal dilution of position
* 545.4,M Altitude, Meters, above mean sea level
* 46.9,M Height of geoid (mean sea level) above WGS84
ellipsoid
(empty field) time in seconds since last DGPS update
(empty field) DGPS station ID number
*47 the checksum data, always begins with *
$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
RMC Recommended Minimum sentence C
* 123519 Fix taken at 12:35:19 UTC
* A Status A=active or V=Void.
* 4807.038,N Latitude 48 deg 07.038' N
* 01131.000,E Longitude 11 deg 31.000' E
* 022.4 Speed over the ground in knots
* 084.4 Track angle in degrees True
* 230394 Date - 23rd of March 1994
* 003.1,W Magnetic Variation
*6A The checksum data, always begins with *
*/
var nmea_rmc_parts = Mbb_Clients[client_id]["LastNmea"]["RMC"].split(",");
if (nmea_rmc_parts[2] == "A")
{
var nmea_gga_parts = Mbb_Clients[client_id]["LastNmea"]["GGA"].split(",");
var position = {};
position["Datetime"] = "20" + nmea_rmc_parts[9].substr(4, 2) + "-" + nmea_rmc_parts[9].substr(2, 2) + "-" + nmea_rmc_parts[9].substr(0, 2);
position["Datetime"] += " " + nmea_rmc_parts[1].substr(0, 2) + ":" + nmea_rmc_parts[1].substr(2, 2) + ":" + nmea_rmc_parts[1].substr(4, 2) + " UTC";
/* Calculate decimal latitude */
var degrees = parseFloat(nmea_rmc_parts[3].substr(0, 2));
var decimal = parseFloat(nmea_rmc_parts[3].substr(2));
position["Latitude"] = degrees + (decimal / 60.0);
if (nmea_rmc_parts[4] == "S")
{
position["Latitude"] = -position["Latitude"];
}
/* Calculate decimal longitude */
var degrees = parseFloat(nmea_rmc_parts[5].substr(0, 3));
var decimal = parseFloat(nmea_rmc_parts[5].substr(3));
position["Longitude"] = degrees + (decimal / 60.0);
if (nmea_rmc_parts[6] == "W")
{
position["Longitude"] = -position["Longitude"];
}
position["Hdop"] = nmea_gga_parts[8];
position["Satellites"] = nmea_gga_parts[7];
position["Altitude"] = nmea_gga_parts[9]; // Meters
position["HeightOfGeoid"] = nmea_gga_parts[11] // Meters
position["Speed"] = nmea_rmc_parts[7]; // Knots
position["Angle"] = nmea_rmc_parts[8];
if (nmea_rmc_parts[10] != "")
{
position["MagneticDeclination"] = parseFloat(nmea_rmc_parts[10]);
if (nmea_rmc_parts[11].substr(0, 1) == "W")
{
position["MagneticDeclination"] = -position["MagneticDeclination"];
}
}
return position;
}
return false;
}