How can i receive Messages in voip? - objective-c

Question

How can I receive Messages in voip? I can get the Voip Token!
I'm writing in Objective C:
I have searched around the internet but can't find any solutions! All I found is Swift, but can't get the token in Swift. In Objective C I can get token but not get Messages from a line.
apn push "<Token>" -c backgroundfetch.pem -m "Hello"
How can I popup a Messages in Objective C? Here is my code:
#import "AppDelegate.h"
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import PushKit;
#import UserNotifications;
#interface AppDelegate ()
#end
#implementation AppDelegate
NSString *fcmToken = #"";
// Trigger VoIP registration on launch
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[self voipRegistration];
return YES;
}
// Register for VoIP notifications
- (void) voipRegistration {
dispatch_queue_t mainQueue = dispatch_get_main_queue();
// Create a push registry object
PKPushRegistry * voipRegistry = [[PKPushRegistry alloc] initWithQueue: mainQueue];
// Set the registry's delegate to self
voipRegistry.delegate = self;
// Set the push type to VoIP
voipRegistry.desiredPushTypes = [NSSet setWithObject:PKPushTypeVoIP];
}
- (void)pushRegistry:(PKPushRegistry *)registry didUpdatePushCredentials:(PKPushCredentials *)credentials forType:(NSString *)type{
if([credentials.token length] == 0) {
NSLog(#"voip token NULL");
return;
}
NSLog(#"PushCredentials: %#", credentials.token);
}
// Handle incoming pushes
- (void)pushRegistry:(PKPushRegistry *)registry didReceiveIncomingPushWithPayload:(PKPushPayload *)payload forType:(NSString *)type {
// Process the received push
NSLog(#"Get");
}
#end
My info.plist:
<key>UIBackgroundModes</key>
<array>
<string>voip</string>
<string>audio</string>
<string>fetch</string>
<string>remote-notification</string>
</array>

Answer 1

In your case the solution is to send a silent push notification. Once the silent push notification arrives, execute your code with background task.
Here is the good explanations for sending a silent push notification.
https://stackoverflow.com/a/36327058/9106403