From 9686992bed6d533beda7eae6929390818d771c93 Mon Sep 17 00:00:00 2001
From: Devdutt Shenoi <devdutt@bytebeam.io>
Date: Tue, 30 Jul 2024 13:46:23 +0530
Subject: [PATCH] feat: `LinkTx::unsubscribe`

---
 rumqttd/src/link/local.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/rumqttd/src/link/local.rs b/rumqttd/src/link/local.rs
index 44b08b5e..3934eace 100644
--- a/rumqttd/src/link/local.rs
+++ b/rumqttd/src/link/local.rs
@@ -1,5 +1,6 @@
 use crate::protocol::{
     Filter, LastWill, LastWillProperties, Packet, Publish, QoS, RetainForwardRule, Subscribe,
+    Unsubscribe,
 };
 use crate::router::Ack;
 use crate::router::{
@@ -281,6 +282,17 @@ impl LinkTx {
         Ok(len)
     }
 
+    /// Sends a MQTT Unsubscribe to the eventloop
+    pub fn unsubscribe<S: Into<String>>(&mut self, filter: S) -> Result<usize, LinkError> {
+        let unsubscribe = Unsubscribe {
+            pkid: 0,
+            filters: vec![filter.into()],
+        };
+
+        let len = self.push(Packet::Unsubscribe(unsubscribe, None))?;
+        Ok(len)
+    }
+
     /// Request to get device shadow
     pub fn shadow<S: Into<String>>(&mut self, filter: S) -> Result<(), LinkError> {
         let message = Event::Shadow(ShadowRequest {