QCoreApplication::postEvent: Unexpected null receiver when calling .addwaypoint function of RouteModel in embedded device.

[Sam_George]

Hi,

So I am using Qtlocation 5.6 to generate map and route between 2 points using RouteModel. The program works perfectly on PC but when running on embedded device the route doesn't update at all. And it throws warning like "QCoreApplication::postEvent: Unexpected null receiver". The function which throws this warning is:
function updateRoute() {
routeQuery.clearWaypoints();
routeQuery.addWaypoint(startMarker.coordinate);
routeQuery.addWaypoint(endMarker.coordinate);
routeModel.update()
}
What can be the issue and how to resolve it?

[Sam_George]

Solved the issue by upgrading Qt from 5.5 to 5.9.

[Sam_George]

Hi All,

I found that the url which my embedded device use to get the route is older one.
http://router.project-osrm.org/viaroute?instructions=true&loc=8.5686,76.8731&loc=8.5241,76.9366 - server replied: Not Found

so i tried to change the url by giving,

                PluginParameter {
                    name: "osm.routing.host"
                    value: "http://router.project-osrm.org/route/v1/driving/"
}

but the new url which was generated by device is,

http://router.project-osrm.org/route/v1/driving/?instructions=true&loc=8.5686,76.8731&loc=8.5241,76.9366 - server replied: Not Found

the required url should be something like,

http://router.project-osrm.org/route/v1/driving/76.8731,8.5686;76.9366,8.5241?overview=full&steps=true&geometries=polyline&alternatives=true

because of the incorrect format the JSON respone which I receive is "Not Found"

I was able to recreate the issue in PC by giving

                PluginParameter {
                    name: "osm.routing.apiversion"
                    value: "v4"
                }

so i thought if i update the osm.routing.apiversion to v5, I may succeed but i still i got the same error. Please help.

[Sam_George]

Solved the issue by upgrading Qt from 5.5 to 5.9.