Communicate data from a rpi to rak 4631 to send over lora

I’m looking to communicate some data over bluetooth from a raspberry pi so i can submit data to the helium network with the rak 4631. Are there any examples or guides someone can send me to help accomplish this?

I guess the easiest is to use BLE UART communication between the RPi and the RAK4631.

For the RAK4631 we have a BLE UART example. For the RPi, I have no idea.

Other option is to create a custom BLE characteristic to transmit the data. This is a little bit more complicated. We have an example for a custom BLE characteristic RAK12019_UVlight_LTR390_Ble in our WisBlock repo as well.
And again, I have nothing for RPi for a custom BLE characteristic.