Hi, I was able to reproduce the following problem (both in simulator and in a Descent MK1 using SDK 3.2.5 and 4.0.6):
If the function setValue is called from onUpdate while makeWebRequest is still waiting for the webserver to return data,
the callback function is "lost" (and not called).
The following code reproduce the problem 100% of the time.
using Toybox.Application;
using Toybox.Background;
using Toybox.System;
using Toybox.WatchUi;
using Toybox.Time;
using Toybox.Communications;
using Toybox.Application.Storage;
(:background)
class PiServiceDelegate extends Toybox.System.ServiceDelegate {
function initialize() {
System.ServiceDelegate.initialize();
}
function onTemporalEvent() {
// That URI takes about 3 seconds to answer
var uri = "https://wb.elaine.fi/pi_slow";
System.println("Before query");
var options = {
:methods => Communications.HTTP_REQUEST_METHOD_GET,
:responseType => Communications.HTTP_RESPONSE_CONTENT_TYPE_JSON
};
Communications.makeWebRequest(uri, null, options,
method(:pi_received));
}
function pi_received(code, data) {
System.println(code);
System.println(data);
if (code == 200) {
Background.exit(data);
}
}
}
(:background)
class PiWatch extends Application.AppBase {
public function initialize() {
AppBase.initialize();
}
function onBackgroundData(data) {
System.println("onBackgroundData: " + data);
}
function getServiceDelegate() {
return [new PiServiceDelegate()];
}
function getInitialView() {
Background.registerForTemporalEvent(new Time.Duration(5 * 60));
return [new PiWatchView(), new PiWatchDelegate()];
}
}
class PiWatchView extends WatchUi.WatchFace {
public function initialize() {
WatchFace.initialize();
}
public function onUpdate(dc) {
System.println("onUpdate");
// On simulator, onUpdate is ran every seconds
// So we will call Storage.setValue between the http request
// and the result
// On watch same problem exists
Storage.setValue("foo", "bar");
// Note that problem does not exists if Storage.setValue
// is called in onPartialUpdate
}
}
class PiWatchDelegate extends WatchUi.WatchFaceDelegate {
public function initialize() {
WatchFaceDelegate.initialize();
}
}
Here is the output:
onUpdate
onUpdate
onUpdate
Background: Before query
onUpdate
onUpdate
onUpdate
Error: Symbol Not Found Error
Details: Failed invoking <symbol>
Stack:
onUpdate
onUpdate
onUpdate
If I comment the setValue line, I get the expected result:
onUpdate
onUpdate
onUpdate
onUpdate
Background: Before query
onUpdate
onUpdate
onUpdate
Background: 200
Background: {pi=>3.140000}
onBackgroundData: {pi=>3.140000}
onUpdate
onUpdate
onUpdate
