send a pre offer to the PNServer for video calls

ts/receiver/callMessage.ts

@@ -26,6 +26,13 @@ export async function handleCallMessage(
     return;
   }
 
+  if (type === SignalService.CallMessage.Type.PRE_OFFER) {
+    await removeFromCache(envelope);
+
+    window.log.info('Skipping callMessage PRE_OFFER');
+    return;
+  }
+
   if (type === SignalService.CallMessage.Type.OFFER) {
     if (Math.max(sentTimestamp - (Date.now() - currentOffset)) > TTL_DEFAULT.CALL_MESSAGE) {
       window?.log?.info('Dropping incoming OFFER callMessage sent a while ago: ', sentTimestamp);

ts/session/messages/outgoing/controlMessage/CallMessage.ts

@@ -29,6 +29,7 @@ export class CallMessage extends ContentMessage {
     // this does not make any sense
     if (
       this.type !== signalservice.CallMessage.Type.END_CALL &&
+      this.type !== signalservice.CallMessage.Type.PRE_OFFER &&
       (!this.sdps || this.sdps.length === 0)
     ) {
       throw new Error('sdps must be set unless this is a END_CALL type message');

ts/session/utils/CallManager.ts

@@ -1,5 +1,5 @@
 import _ from 'lodash';
-import { ToastUtils } from '.';
+import { MessageUtils, ToastUtils } from '.';
 import { getCallMediaPermissionsSettings } from '../../components/session/settings/SessionSettings';
 import { getConversationById } from '../../data/data';
 import { ConversationModel } from '../../models/conversation';
@@ -16,10 +16,11 @@ import {
 import { getConversationController } from '../conversations';
 import { CallMessage } from '../messages/outgoing/controlMessage/CallMessage';
 import { ed25519Str } from '../onions/onionPath';
-import { getMessageQueue } from '../sending';
+import { getMessageQueue, MessageSender } from '../sending';
 import { PubKey } from '../types';
 
 import { v4 as uuidv4 } from 'uuid';
+import { PnServer } from '../../pushnotification';
 
 export type InputItem = { deviceId: string; label: string };
 
@@ -373,6 +374,18 @@ export async function USER_callRecipient(recipient: string) {
   }
   currentCallUUID = uuidv4();
   peerConnection = createOrGetPeerConnection(recipient, true);
+  // send a pre offer just to wake up the device on the remote side
+  const preOfferMsg = new CallMessage({
+    timestamp: Date.now(),
+    type: SignalService.CallMessage.Type.PRE_OFFER,
+    uuid: currentCallUUID,
+  });
+
+  window.log.info('Sending preOffer message to ', ed25519Str(recipient));
+  const rawMessage = await MessageUtils.toRawMessage(PubKey.cast(recipient), preOfferMsg);
+  const { wrappedEnvelope } = await MessageSender.send(rawMessage);
+  await PnServer.notifyPnServer(wrappedEnvelope, recipient);
+
   await openMediaDevicesAndAddTracks();
 }