Question on using Byte array in characteristics

[aidengk-iris]

Dear all,

I am looking for a way to use byte arrays in a characteristic. My application constantly streams data out via characteristic notifications, so the value of each notification is in the order of hundreds Bytes.

I tried to define a streaming characteristic as:

// GATT Server definition
#[gatt_server]
struct Server {
    streaming_service: StreamingService,
}

/// streaming service definition
#[gatt_service(uuid ="eceeb6d2-2fa4-41f8-9e52-dc3c9cbf5a0d")]
struct StreamingService{
    #[characteristic(uuid = "408813df-5dd4-1f87-ec11-cdb001100000", read, notify)]
    rssi: i8,
    #[characteristic(uuid = "408813df-5dd4-1f87-ec11-cdb001103245", read, notify)]
    streaming_data: [u8; 160],
}

But I apparently didn't set the data type correctly. What would be the correct/recommended way to set a byte array as the characteristic value?
Any insight is appreciated.
Thank you!

[HaoboGu]

This issue should be already fixed by #322 , but you have to set a default value for this field.

[petekubiak]

Yes this is correct, I was worried that because we couldn't inject our own message into the error or perform compile-time analysis of the type it might lead to confusion like this.

Recently however I've come across Crabtime which would allow this kind of compile-time evaluation and the ability to generate a custom error message, so that would be a nice enhancement.

[aidengk-iris]

Thank you @HaoboGu and @petekubiak , I confirm I could compile after adding the default value! Closing the question.