Refactor framed stream

crates/items_0/src/items_0.rs

@@ -151,6 +151,7 @@ pub trait Events:
     fn pulses(&self) -> &VecDeque<u64>;
     fn frame_type_id(&self) -> u32;
     fn to_min_max_avg(&mut self) -> Box<dyn Events>;
+    fn to_json_string(&self) -> String;
     fn to_json_vec_u8(&self) -> Vec<u8>;
     fn to_cbor_vec_u8(&self) -> Vec<u8>;
     fn clear(&mut self);
@@ -273,6 +274,10 @@ impl Events for Box<dyn Events> {
         Events::to_min_max_avg(self.as_mut())
     }
 
+    fn to_json_string(&self) -> String {
+        Events::to_json_string(self.as_ref())
+    }
+
     fn to_json_vec_u8(&self) -> Vec<u8> {
         Events::to_json_vec_u8(self.as_ref())
     }