get ApplicationContext on react-native - swift

Question

I have a watchKit app connected with a react-native iOS app with react-native-watch-connectivity.
I want to use the applicationContext to communicate between the devices.
From react-native, I use watch.updateApplicationContext({ dataFromRN: "data" }) to define it and I can get it in iWatch side.
But when I use updateApplicationContext(["data":"data"]) in iWatch side, an updated context event is catch by react-native but the data is not updated.
// iWatch
try session?.updateApplicationContext(["dataFromWatch":"data"])
print(session?.applicationContext ?? "")
["dataFromWatch": "data"]
but in react-native, I have the following output for this event:
// react-native iOS
receiveApplicationContext(err, applicationContext) {
console.log("receiveApplicationContext()", applicationContext)
receiveApplicationContext() {dataFromRN: "data"}
dataFromRN is a previous applicationContext defined from react-native side.
Event if react-native catch an event, the applicationContext is not updated.
(react-native-watch-connectivity has react version defined to 15.4.2 but I'm using react 16.2.0. Is something can be breaking changed between this versions ?)
I guess I have to update something in react-native-watch-connectivity, but I would like to know where.
If you have any element to fix this issue...
Thx
iOS side (with react-native)
import React, { Component } from "react";
import {
Platform,
StyleSheet,
Text,
View,
ScrollView,
AsyncStorage,
TouchableHighlight
} from "react-native";
import * as watch from "react-native-watch-connectivity";
type Props = {};
export default class App extends Component<Props> {
constructor(props) {
super(props);
this.state = { match: [] };
this.receiveUserInfo = this.receiveUserInfo.bind(this);
this.subscribeToApplicationContext = this.subscribeToApplicationContext.bind(this);
this.subscribeToWatchEvents = this.subscribeToWatchEvents.bind(this);
}
receiveUserInfo(err, userInfo) {
if (!err) {
if (userInfo.currentMatch !== undefined) {
console.log("receiveUserInfo()", userInfo);
}
}
}
receiveApplicationContext(err, applicationContext) {
if (!err) {
console.log("receiveApplicationContext()", applicationContext);
watch.getApplicationContext().then(context => {
console.log("getApplicationContext()", context);
});
}
}
subscribeToWatchEvents() {
this.subscriptions = [
watch.subscribeToUserInfo(this.receiveUserInfo),
watch.subscribeToApplicationContext(this.receiveApplicationContext)
];
}
componentDidMount() {
this.subscribeToWatchEvents();
}
componentWillUnmount() {}
render() {
return (
<View/>
);
}
}
iWatch side (swift)
import WatchKit
import Foundation
import WatchConnectivity
class MainController: WKInterfaceController, WCSessionDelegate {
var session: WCSession?
override func awake(withContext context: Any?) {
super.awake(withContext: context)
if WCSession.isSupported() {
self.session = WCSession.default
self.session?.delegate = self
self.session?.activate()
}
}
func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
print("activationDidCompleteWith", activationState)
}
func session(_ session: WCSession, didReceiveApplicationContext applicationContext: [String : Any]) {
print("didReceiveApplicationContext", applicationContext)
}
func sendUserInfo() {
session?.transferUserInfo(["data":"data"])
do {
try session?.updateApplicationContext(["data":"data"])
} catch {
print("updateApplicationContext error")
}
print(session?.applicationContext ?? "")
}
#IBAction func point() {
sendUserInfo()
}
}

Answer 1

There doesn't seem to be any issue in your MainController InterfaceController but if you send the same message via updateApplicationContext:, it's ignored on the other counterpart app by default.
Basically, do not to send the same applicationContext.
Check this, for test purpose, we just add a random number to the applicationContext payload so it is different for successive calls.
func sendUserInfo() {
do {
try session?.updateApplicationContext(["from" : "watch \(arc4random()"])
}
catch {
print(error)
}
}