Detect many devices - peers using Multipeer Connectivity

Question

Created Jun ’19

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Hello there! I am developing an application with which I want to locate nearby iPhones through the Multipeer Connecvitity protocol and communicate with them. I have two questions regarding the MC protocol.

First, can I (somehow) get the distance between the other iPhones and my device (with Bluetooth LE signal), the same way I would do so using the iBeacon technology?

Second, I read somewhere that each MCSession has a limit of 8 peers. Is that true? See, I want my application to be able to detect many peers (as many as possible around me - since they have the same app installed and running). How could I resolve this, in case one MCSession has an 8 peer limit? Could I initiate multiple MCSessions, with my device as the only common peer in each one?

I would be really gratefull if someone could help me figure these out! Thank you in advance!

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Answer 1

DTS Engineer OP

Apple

Jun ’19

First, can I (somehow) get the distance between the other iPhones and my device (with Bluetooth LE signal), the same way I would do so using the iBeacon technology?

No.

Second, I read somewhere that each
MCSession
has a limit of 8 peers. Is that true?

There’s certainly a limit. I don’t remember what the current value is, but you can get it by printing

kMCSessionMaximumNumberOfPeers

.

See, I want my application to be able to detect many peers (as many as possible around me - since they have the same app installed and running)

It sounds like using Bonjour directly would be a better match for your requirements. Check out

NSNetService

and it’s

includesPeerToPeer

flag. Or the new Bonjour browser support we just announced for the Network framework.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

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Answer 2

TasosN OP

Jun ’19

Thank you eskimo! I will look into it! However, I will try to build and "trigger" a multiple mcsession scenario. Afterall, the Multipeer Connectivity protocol is based on Bonjour 🙂 Thank you again!

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