diff --git a/src/communication.rs b/src/communication.rs
index f81cd87..ce0b8a3 100644
--- a/src/communication.rs
+++ b/src/communication.rs
@@ -3,7 +3,7 @@ use defmt::{info, error};
 use embassy_executor::Spawner;
 use embassy_sync::blocking_mutex::raw::ThreadModeRawMutex;
 use embassy_stm32::usb::Driver;
-use embassy_stm32::{peripherals, usb};
+use embassy_stm32::{peripherals, uid, usb};
 
 use postcard_rpc::{
     define_dispatch,
@@ -19,7 +19,9 @@ use postcard_rpc::{
 
 use bioz_icd_rs::{PingEndpoint, GetUniqueIdEndpoint, ENDPOINT_LIST, TOPICS_IN_LIST, TOPICS_OUT_LIST};
 
-pub struct Context;
+pub struct Context {
+    pub unique_id: [u8; 12],
+}
 
 type AppDriver = usb::Driver<'static, peripherals::USB>;
 type AppStorage = WireStorage<ThreadModeRawMutex, AppDriver, 256, 256, 64, 256>;
@@ -96,7 +98,10 @@ pub fn init_communication(usb_driver: Driver<'static, peripherals::USB>, spawner
     let pbufs = PBUFS.take();
     let config = usb_config();
 
-    let context = Context;
+    let context = Context {
+        unique_id: *uid::uid(),
+    };
+
     let (device, tx_impl, rx_impl) = STORAGE.init(usb_driver, config, pbufs.tx_buf.as_mut_slice());
     let dispatcher = MyApp::new(context, spawner.into());
     let vkk = dispatcher.min_key_len();
@@ -116,7 +121,7 @@ fn ping_handler(_context: &mut Context, _header: VarHeader, rqst: u32) -> u32 {
     rqst
 }
 
-fn get_unique_id_handler(_context: &mut Context, _header: VarHeader, _rqst: ()) -> u64 {
+fn get_unique_id_handler(context: &mut Context, _header: VarHeader, _rqst: ()) -> [u8; 12] {
     info!("get_unique_id");
-    200
+    context.unique_id
 }
\ No newline at end of file