NRF8001 data sending time is too long

[JeffreyRyan]

Hi!

I'm using nrf8001 to send twenty 20-byte packets to a phone application. The connection interval I use is 30ms. However, I takes 5 seconds to send the data to the phone. Why is this so?

Ideally, it should take around 600ms right? But 5 seconds is too much.

Some info:

• The firmware is set to send data, wait for event, and then when there is an event, send another data while receiving that event. The cycle goes on until all 20 packets is sent. 
• The spi rate is set to 3MHz (which is the maximum allowed in nrf8001)
• The ble is set to pairing mode
• Pipe 3 is used (no ack)

[awneil]

JeffreyRyan said:

the phone

What phone?

Is it different with other phones?

JeffreyRyan said:

The connection interval I use is 30ms

Do you mean, "the connection interval I request is 30ms" ?

Have you confirmed what connection interval is actually being used?

Have you instrumented your code to see what's happening there?

Have you investigated the phone side to see what's happening there?

If you're on Android, have you looked at the Bluetooth HCI logs?

https://blog.bluetooth.com/debugging-bluetooth-with-an-android-app