Firestore taking too much time to update from flutter app - flutter

Question

I want to update a field of a particular document in firestore while listening to any change in its value. So basically, when the field 'call' is found to be 1, we will update it again back to 0 after printing a message. However, it takes too much time to update. On the other hand, updating the same field using python is way quicker. Please advise me what should be done.
FirebaseFirestore.instance
.collection('joystick')
.snapshots()
.listen((QuerySnapshot querySnapshot) {
var firestoreList = querySnapshot.docs;
var data = firestoreList.first.data();
var callval = firestoreList.first.get('call');
print("call value while listening ${callval}");
if(callval == 1){
print("call value is 1 ");
//makecall();
FirebaseFirestore.instance.collection('joystick').doc('data').update({'call':0});
call = firestoreList.first.get('call');
print("Next call value is ${call}");
if(call == 0){
print("updated!");
callval = 0;
}
}
}).onError((e) => print(e));

Answer 1

Document writing takes as long as it takes and depends on network connection speed. But you can speed up uploading data by compressing them. Dart has a useful tool as GZip. GZip can compress String data up to 99% You can decode/encode data in many ways even HttpClient can autoUncompress it :).
import 'dart:io';
// Send compressed data.
Future<void> sendCompressed() async {
final gzip = GZipCodec();
// You can convert any data to JSON string with `dart:convert`.
const String jsonToSend = '{"field": "Some JSON to send to the server."}';
// Original Data.
final List<int> original = utf8.encode(jsonToSend);
// Compress data.
final List<int> compressed = gzip.encode(original);
// Send compressed to db.
print(compressed);
}
// Get compressed data.
Future<void> getCompressed() async {
final gzip = GZipCodec();
// Get compressed data from the data base.
final List<int> compressed = await http.get('https://data.com');
// Decompress
final List<int> decompress = gzip.decode(compressed);
// Decode back to String (JSON)
final String decoded = utf8.decode(decompress);
// Do what you want with decoded data.
print(decoded);
}