data transmission rate...to slow...
data transmission rate...to slow...
- Subject: data transmission rate...to slow...
- From: William Henderson <email@hidden>
- Date: Sat, 11 May 2013 22:00:14 -0700
Etan,
Which direction were you sending in? I'm not seeing anything near that rate when going from central->peripheral (using writewithoutresponse, scanning off, advertising off)...
William
Frederic,
there is only one packet of up to ~20 bytes transmitted every two connection events if you use reliable data transfer.
If you want to increase that to ~ four packets every connection event, you have to use unreliable data transfer (WriteWithoutResponse / Notification)
and have to add reliability in your app layer.
Note that WiFi interferes with BLE, disabling it should net you a small boost in throughput.
These are the throughputs I could achieve with iPhone as central and dedicated peripheral: http://www.scriptreactor.com/conn_interval-throughput.pdf
Etan
I have made some tests to exchange data between 2 iDevices (iOS6 iPad3/iPhone5) using CBPeripheralManagerConnectionLatencyLow settings.
The maximum rate I have is 1135 bytes / s (1.1KB/s)
- Is it possible to get better speed ?
- What is the maximum I can have with iOS stack ?
From some documents:
BLE: 200kbits/s -> 25KB/s
NFC: 424kbits/s
Why is the difference so huge (20x slower) ?
Fred
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