Add cursor around cbor writer to get write position back

Cargo.toml

@@ -26,6 +26,7 @@ bitmaps = { version = "3.1", default-features = false }
 heapless = { version = "0.8", features = ["serde"] }
 serde = { version = "1.0", default-features = false, features = ["derive"] }
 
+minicbor = { version = "0.25", optional = true }
 minicbor-serde = { version = "0.3.2", optional = true }
 
 
@@ -72,13 +73,13 @@ hex = { version = "0.4.3", features = ["alloc"] }
 [features]
 default = ["ota_mqtt_data", "provision_cbor"]
 
-provision_cbor = ["minicbor-serde"]
+provision_cbor = ["dep:minicbor", "dep:minicbor-serde"]
 
-ota_mqtt_data = ["minicbor-serde"]
+ota_mqtt_data = ["dep:minicbor", "dep:minicbor-serde"]
 
 ota_http_data = []
 
-std = ["serde/std", "minicbor-serde/std"]
+std = ["serde/std", "minicbor-serde?/std"]
 
 defmt = [
     "dep:defmt",

src/ota/encoding/cbor.rs

@@ -76,9 +76,10 @@ pub fn to_slice<T>(value: &T, slice: &mut [u8]) -> Result<usize, ()>
 where
     T: serde::ser::Serialize,
 {
-    let mut serializer = minicbor_serde::Serializer::new(slice);
+    let mut serializer =
+        minicbor_serde::Serializer::new(minicbor::encode::write::Cursor::new(slice));
     value.serialize(&mut serializer).map_err(|_| ())?;
-    Ok(serializer.into_encoder().writer().len())
+    Ok(serializer.into_encoder().writer().position())
 }
 
 impl<'a> From<GetStreamResponse<'a>> for FileBlock<'a> {