DA14531 Bluetooth version

Hi Yoshihiko-san,

Thank you for posting your question online.

Yoshihiko said:

Where can I set the Bluetooth version?

The BLE Core on the DA14531 is based on the Bluetooth SIG Core Specification v5.1. It contains all the mandatory features of the Core Specification v5.1 but not all the optional features offered.

Yoshihiko said:

However, since I want to send about 250 bytes of data, I want to switch to Bluetooth5.0 to increase the amount of data I can send.

You are not going to be able to send 250 bytes of data via the Advertising Data. 
Advertising data consists of 31 bytes which 3 of them are reserved for flags on Connectable Advertising. You can also use the Scan Response Data which also consists of 31 bytes. 
If you want to send 250 bytes of data, you will have to establish a BLE connection and then send those data via a Characteristic.

Best Regards,
OV_Renesas

Thank you for your reply.

On the Bluetooth5 page, it says "Extended advertising allows packets to be up to 255 octets long. " but is it possible to use this function?

Bluetooth_5-FINAL.pdf (Look at P15)

Hi Yoshihiko-san,

Thank you for the reply.
The "Extended Advertising" feature is considered an optional feature on the Bluetooth Specification.
The DA14531 does not support Extended Advertising feature. 
You are not going to be able to use Extended Advertising on the DA14531.

Best Regards,
OV_Renesas