Questions about MQTT

[wonder]

Hello hello,

Erel, I remember seeing a thread a while ago which contained a video of you drawing some circles on the PC and having it being streamed instantaneously to the Android device.

Was it a library? I can't find it.
Can I use it for a multiplayer game?

Many thanks in advance!

 

[Erel]

You are looking for MQTT: https://www.b4x.com/android/forum/threads/iot-mqtt-protocol.59471/#content

It is a good solution for multiplayer games.

 

[wonder]

Thank you so much!!!
By the way, where's that video example?

 

[Erel]

You can find all the videos that I've uploaded here: https://www.youtube.com/channel/UCgO74_195wKn60Y7ZV3DzIQ

 

[wonder]

Fantastic, thank you!!
I have no idea how, but I want to build a B4J server that uses this kind of technology.
Time to learn some new stuff.

 

[DonManfred]

 

[DonManfred]

Time to learn some new stuff.

You dont need to learn much as B4J uses the same language as B4A

 

[LucaMs]

From here:

I'm thinking if this MQTT can be useful (more useful) for my project (multiplayer turn based game).

From this thread:

...
It is a good solution for multiplayer games.

AAAARRRGH (which means: "now I don't know if I should "move" to MQTT )

 

[wonder]

Thank you so much, guys!!

Some questions:
- Will it be fast enough to real-time multiplayer?
- Is it possible to achieve a ping time between 30 and 50 milliseconds?
- If so, it does depend on the server, right?
- What would be the maximum data package size (in bytes) to achieve such values?

 

[Erel]

If you are using an online server (over the internet) then you should expect latency of at least 100ms. The message size and protocol are less important.

 

[wonder]

So, how do online games achieve lower latency values?
Assuming that I have my own B4J server, it should be possible (maybe without MQTT?) , right?

 

[Erel]

Assuming that I have my own B4J server, it should be possible (maybe without MQTT?) , right?

No. The latency I talk about is not related to the protocol. It takes time for a single byte to go from your computer, through all the gateways and reach the server.

If your server is physically close to the users then the latency will be smaller.

Whether you choose a MQTT server or HTTP server will most probably not affect the latency at all.

For example a ping round-trip to b4x.com:
My computer in Israel - ~200ms
A computer in USA - ~30ms

 

[wonder]

So the way to achieve 30ms would be having several region dedicated servers around the globe. (Not that I have the money for that, ahah)

 

[EnriqueGonzalez]

You may not, but Amazon has that kind of infrasctructure and you can rent it,
https://aws.amazon.com

For example, Netflix uses it. I think it is possible to have a B4J (java) app there.