NRF52840 + PHY_CODED + Android : Possible?

[marchefeu]

Hi,

I have a project that need to use a long range bluetooth communication with an Android smartphone or tablet

I use for test a tablet Lenovo Tab M8 TB8505F, NRF Connect says it was fully compatible with Bluetooth Low Energy: High speed and Long range is supported.

I have download project nRF5_SDK_15.2.0_mod.zip found in this post.

When I flash example ble_app_uart to DK board, the tablet doesn't detect it. But when I replace the BLE_GAP_PHY_CODED by BLE_GAP_PHY_1MBPS, project works fine.

init.config.ble_adv_primary_phy = BLE_GAP_PHY_1MBPS; // BLE_GAP_PHY_CODED;
init.config.ble_adv_secondary_phy = BLE_GAP_PHY_1MBPS; // BLE_GAP_PHY_CODED;

The range are better but not sufficient for my project.

is someone already realized a communication using PHY_CODED with a phone? However, what is wrong in this example?

Regards

Pascal

[awneil]

marchefeu said:

nRF5_SDK_15.2.0

That's rather old - Current SDK version is 17.0.2

[marchefeu]

I work on version 17.0.2, program work but not with phy codec , tablet doesn't see it.

I have tested with SDK 15.2.0 or 17.0.2, Android device doesn't detect it. (or it's Nrf Connect that didn't see it...)

[marchefeu]

Hello,

yes, smartphone doesn't see nrf52840 with PHY CODED.

Picture link works fine now.

regards

Pascal

[awneil]

again, it would be easier if you just put the image in a post - where we can see it:

[marchefeu]

a picture will not solved my problem...

[awneil]

making it accessible will help others to help you

[Jared]

marchefeu said:

yes, smartphone doesn't see nrf52840 with PHY CODED.

 Which smartphone are you using?

Regarding your project, you should also add extended advertising in the advertising init routine: 

    init.config.ble_adv_extended_enabled  = true;

And consider increasing the TX power after the advertising has been started:

    err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, m_advertising.adv_handle, 8);

    APP_ERROR_CHECK(err_code);

Try to diff your project with the working CODED PHY example that is shared in this post.

 

regards

Jared