diff --git a/examples/esp32/Cargo.lock b/examples/esp32/Cargo.lock
index 8cc0456f..c8dcf72c 100644
--- a/examples/esp32/Cargo.lock
+++ b/examples/esp32/Cargo.lock
@@ -789,9 +789,9 @@ checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
 [[package]]
 name = "indexmap"
-version = "2.7.0"
+version = "2.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62f822373a4fe84d4bb149bf54e584a7f4abec90e072ed49cda0edea5b95471f"
+checksum = "8c9c992b02b5b4c94ea26e32fe5bccb7aa7d9f390ab5c1221ff895bc7ea8b652"
 dependencies = [
  "equivalent",
  "hashbrown",
@@ -1353,9 +1353,9 @@ checksum = "e87a2ed6b42ec5e28cc3b94c09982969e9227600b2e3dcbc1db927a84c06bd69"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.14"
+version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adb9e6ca4f869e1180728b7950e35922a7fc6397f7b641499e8f3ef06e50dc83"
+checksum = "11cd88e12b17c6494200a9c1b683a04fcac9573ed74cd1b62aeb2727c5592243"
 
 [[package]]
 name = "usb-device"
@@ -1369,9 +1369,9 @@ dependencies = [
 
 [[package]]
 name = "uuid"
-version = "1.12.0"
+version = "1.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "744018581f9a3454a9e15beb8a33b017183f1e7c0cd170232a2d1453b23a51c4"
+checksum = "b3758f5e68192bb96cc8f9b7e2c2cfdabb435499a28499a42f8f984092adad4b"
 
 [[package]]
 name = "vcell"
diff --git a/examples/serial-hci/Cargo.lock b/examples/serial-hci/Cargo.lock
index 57457610..5bf7b102 100644
--- a/examples/serial-hci/Cargo.lock
+++ b/examples/serial-hci/Cargo.lock
@@ -872,11 +872,11 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "2.0.9"
+version = "2.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f072643fd0190df67a8bab670c20ef5d8737177d6ac6b2e9a236cb096206b2cc"
+checksum = "d452f284b73e6d76dd36758a0c8684b1d5be31f92b89d07fd5822175732206fc"
 dependencies = [
- "thiserror-impl 2.0.9",
+ "thiserror-impl 2.0.11",
 ]
 
 [[package]]
@@ -892,9 +892,9 @@ dependencies = [
 
 [[package]]
 name = "thiserror-impl"
-version = "2.0.9"
+version = "2.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b50fa271071aae2e6ee85f842e2e28ba8cd2c5fb67f11fcb1fd70b276f9e7d4"
+checksum = "26afc1baea8a989337eeb52b6e72a039780ce45c3edfcc9c5b9d112feeb173c2"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -973,7 +973,7 @@ dependencies = [
  "log",
  "num_enum",
  "static_cell",
- "thiserror 2.0.9",
+ "thiserror 2.0.11",
  "trouble-host-macros",
 ]
 
diff --git a/host-macros/src/uuid.rs b/host-macros/src/uuid.rs
index d252e5ed..aa246619 100644
--- a/host-macros/src/uuid.rs
+++ b/host-macros/src/uuid.rs
@@ -11,15 +11,13 @@ use quote::quote;
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub enum Uuid {
     Uuid16(u16),
-    Uuid128([u8; 16]),
+    Uuid128(u128)
 }
 
 impl FromMeta for Uuid {
     fn from_string(value: &str) -> darling::Result<Self> {
         if let Ok(u) = uuid::Uuid::from_str(value) {
-            let mut bytes = u.as_bytes().to_owned();
-            bytes.reverse(); // Little-endian, as per Bluetooth spec
-            return Ok(Uuid::Uuid128(bytes));
+            return Ok(Uuid::Uuid128(u.as_u128()))   // tbd. does this treat big/little the right way?
         }
 
         if value.len() == 4 {
@@ -38,13 +36,7 @@ impl quote::ToTokens for Uuid {
     fn to_tokens(&self, tokens: &mut TokenStream2) {
         match self {
             Uuid::Uuid16(u) => tokens.extend(quote!(::trouble_host::types::uuid::Uuid::new_short(#u))),
-            Uuid::Uuid128(u) => {
-                let mut s = TokenStream2::new();
-                for b in u {
-                    s.extend(quote!(#b,))
-                }
-                tokens.extend(quote!(::trouble_host::types::uuid::Uuid::new_long([#s])));
-            }
+            Uuid::Uuid128(u) => tokens.extend(quote!(::trouble_host::types::uuid::Uuid::new_long(#u))),
         }
     }
 }
diff --git a/host/src/types/uuid.rs b/host/src/types/uuid.rs
index 23214975..e27f75e4 100644
--- a/host/src/types/uuid.rs
+++ b/host/src/types/uuid.rs
@@ -45,14 +45,17 @@ impl From<u16> for Uuid {
 }
 
 impl Uuid {
+    // Note: 'new_{short|long}' are 'const fn'; '::from' implementations cannot be.
+    //      Thus, there might be a place for both, though they look superficially overlapping.
+
     /// Create a new 16-bit UUID.
     pub const fn new_short(val: u16) -> Self {
         Self::Uuid16(val.to_le_bytes())
     }
 
-    /// Create a new 128-bit UUID.
-    pub const fn new_long(val: [u8; 16]) -> Self {
-        Self::Uuid128(val)
+    /// Create a new 128-bit UUID. THIS MIGHT NOT NEED TO EXIST
+    pub const fn new_long(val: u128) -> Self {
+        Self::Uuid128(val.to_le_bytes())
     }
 
     /// Copy the UUID bytes into a slice.
@@ -95,6 +98,30 @@ impl Uuid {
     }
 }
 
+impl From<u16> for Uuid {
+    fn from(data: u16) -> Self {
+        Uuid::Uuid16(data.to_le_bytes())
+    }
+}
+
+impl From<u128> for Uuid {
+    fn from(data: u128) -> Self {
+        Self::Uuid128(data.to_le_bytes())
+    }
+}
+
+impl From<[u8; 2]> for Uuid {
+    fn from(data: [u8; 2]) -> Self {
+        Self::Uuid16(data)
+    }
+}
+
+impl From<[u8; 16]> for Uuid {
+    fn from(data: [u8; 16]) -> Self {
+        Self::Uuid128(data)
+    }
+}
+
 impl TryFrom<&[u8]> for Uuid {
     type Error = crate::Error;
 
diff --git a/host/tests/gatt.rs b/host/tests/gatt.rs
index 7d12d128..c7db350f 100644
--- a/host/tests/gatt.rs
+++ b/host/tests/gatt.rs
@@ -9,10 +9,10 @@ mod common;
 const CONNECTIONS_MAX: usize = 1;
 const L2CAP_CHANNELS_MAX: usize = 3;
 
-const SERVICE_UUID: Uuid = Uuid::new_long([
+const SERVICE_UUID: Uuid = Uuid::new_long_from_arr([
     0x00, 0x00, 0x10, 0x00, 0xb0, 0xcd, 0x11, 0xec, 0x87, 0x1f, 0xd4, 0x5d, 0xdf, 0x13, 0x88, 0x40,
 ]);
-const VALUE_UUID: Uuid = Uuid::new_long([
+const VALUE_UUID: Uuid = Uuid::new_long_from_arr([
     0x00, 0x00, 0x10, 0x01, 0xb0, 0xcd, 0x11, 0xec, 0x87, 0x1f, 0xd4, 0x5d, 0xdf, 0x13, 0x88, 0x40,
 ]);
 
diff --git a/host/tests/gatt_derive.rs b/host/tests/gatt_derive.rs
index 301b8202..a275a9a7 100644
--- a/host/tests/gatt_derive.rs
+++ b/host/tests/gatt_derive.rs
@@ -10,10 +10,10 @@ mod common;
 const CONNECTIONS_MAX: usize = 1;
 const L2CAP_CHANNELS_MAX: usize = 3;
 
-const SERVICE_UUID: Uuid = Uuid::new_long([
+const SERVICE_UUID: Uuid = Uuid::new_long_from_arr([
     0x00, 0x00, 0x10, 0x00, 0xb0, 0xcd, 0x11, 0xec, 0x87, 0x1f, 0xd4, 0x5d, 0xdf, 0x13, 0x88, 0x40,
 ]);
-const VALUE_UUID: Uuid = Uuid::new_long([
+const VALUE_UUID: Uuid = Uuid::new_long_from_arr([
     0x00, 0x00, 0x10, 0x01, 0xb0, 0xcd, 0x11, 0xec, 0x87, 0x1f, 0xd4, 0x5d, 0xdf, 0x13, 0x88, 0x40,
 ]);