much progress, descriptors and sample rates getting basically working?

src/log.rs

@@ -0,0 +1,30 @@
+// src/log.rs (or log/mod.rs)
+#[cfg(feature = "defmt")]
+pub use defmt::{debug, error, info, trace, warn};
+
+#[cfg(not(feature = "defmt"))]
+mod no_defmt {
+    #[macro_export]
+    macro_rules! trace {
+        ($($t:tt)*) => {};
+    }
+    #[macro_export]
+    macro_rules! debug {
+        ($($t:tt)*) => {};
+    }
+    #[macro_export]
+    macro_rules! info {
+        ($($t:tt)*) => {};
+    }
+    #[macro_export]
+    macro_rules! warn {
+        ($($t:tt)*) => {};
+    }
+    #[macro_export]
+    macro_rules! error {
+        ($($t:tt)*) => {};
+    }
+}
+
+#[cfg(not(feature = "defmt"))]
+pub use no_defmt::*;