Hi Nick,
Thanks for your reply. NMEA Parser is not a problem. I wrote a simple one and it works fine.
But I'm having trouble making the custom datasource to work and hoping you can help me out. Here is my simple implementation of the custom datasource for trying it out. Sorry I'm still on 10.2.5.
import UIKit
import ExternalAccessory
class FCNSWGPSLocationDataSource: NSObject, AGSLocationDisplayDataSource
{
var delegate: AGSLocationDisplayDataSourceDelegate!
var error: Error!
var isStarted = false
var sessionController: SessionController!
var accessory: EAAccessory?
required public init(sessionController: SessionController)
{
self.sessionController = sessionController
self.accessory = sessionController._accessory
}
func start()
{
NotificationCenter.default.addObserver(self, selector: #selector(sessionDataReceived), name: NSNotification.Name(rawValue: "EXGPSSessionDataReceivedNotification"), object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(accessoryDidDisconnect), name: NSNotification.Name.EAAccessoryDidDisconnect, object: nil)
let sessionOpened = self.sessionController.openSession()
self.isStarted = sessionOpened
if sessionOpened
{
self.delegate.locationDisplayDataSourceStarted(self)
}
else
{
self.error = NSError(domain: "", code: -1, userInfo: [NSLocalizedDescriptionKey: "Failed to open an EA session."])
self.delegate.locationDisplayDataSource(self, didFailWithError: self.error)
}
}
func stop()
{
NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: "EXGPSSessionDataReceivedNotification"), object: nil)
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.EAAccessoryDidDisconnect, object: nil)
self.sessionController.closeSession()
self.isStarted = false
self.delegate.locationDisplayDataSourceStopped(self)
}
// MARK: - Session Updates
func sessionDataReceived(_ notification: Notification)
{
if sessionController._dataAsString != nil
{
let rawNMEAString = sessionController._dataAsString!
let nmeaSentences = rawNMEAString.components(separatedBy: "\r\n")
var rmcData: RmcData!
var ggaData: GgaData!
var gsaData: GsaData!
for nmeaSentence in nmeaSentences
{
if let nmeaData = NmeaParser.parseSentence(data: nmeaSentence)
{
if nmeaData.isKind(of: RmcData.self)
{
rmcData = nmeaData as! RmcData
}
else if nmeaData.isKind(of: GgaData.self)
{
ggaData = nmeaData as! GgaData
}
else if nmeaData.isKind(of: GsaData.self)
{
gsaData = nmeaData as! GsaData
}
}
}
if rmcData != nil
{
let coordinate = CLLocationCoordinate2D(latitude: rmcData.latitude, longitude: rmcData.longitude)
//these are just for testing purposes and the real data should come from the GGA and GSA sentences
let altitude = CLLocationDistance(0)
let horizontalAccuracy = CLLocationAccuracy(0)
let verticalAccuracy = CLLocationAccuracy(0)
let clLocation = CLLocation(coordinate: coordinate,
altitude: altitude,
horizontalAccuracy: horizontalAccuracy,
verticalAccuracy: verticalAccuracy,
course: rmcData.course,
speed: rmcData.speed,
timestamp: rmcData.timeStamp)
let agsLocation = AGSLocation(clLocation: clLocation)
self.delegate.locationDisplayDataSource(self, didUpdateWith: agsLocation)
self.delegate.locationDisplayDataSource(self, didUpdateWithHeading: rmcData.course)
}
}
// MARK: - EAAccessory Disconnection
func accessoryDidDisconnect(_ notification: Notification)
{
let disconnectedAccessory = notification.userInfo![EAAccessoryKey]
if (disconnectedAccessory as AnyObject).connectionID == accessory?.connectionID
{
}
}
}
In the above codes the sessionController is from Bad Elf sample app which communicates with the connected accessory to retrieve nmea string data. I think this bit works fine as I can get valid nmea sentences as shown below and the latitude and longitude creating the agsLocation object are correct:
I create an instance of my custom datasource class and set the mapView.locationDisplay.dataSource with the instance. Then after the map fully loads, if I try to invoke the mapView.locationDisplay.startDataSource(), the map always zooms to the centre of the map and displays the gps symbol there, not the expected current location. I checked the mapView.locationDisplay.location and mapLocation() and they are all nil. Obviously the location update did not get to pass through to the location display. What did I do wrong? By the way, Collector does the correct thing with the same gps device!
Thank you very much for your help.
Shimin
Hi Nick,
it looks ok to me. I think the 4326 is WGS84.
Thanks,
Shimin
