feat: support firmware update control for esp-hosted

embassy-net-esp-hosted/src/control.rs

@@ -24,6 +24,11 @@ pub struct Control<'a> {
     shared: &'a Shared,
 }
 
+/// Handle for managing firmware update.
+pub struct UpdateControl<'a, 'd> {
+    control: &'a mut Control<'d>,
+}
+
 /// WiFi mode.
 #[allow(unused)]
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
@@ -146,6 +151,13 @@ impl<'a> Control<'a> {
         Ok(())
     }
 
+    /// Initiate a firmware update.
+    pub async fn update(&mut self) -> Result<UpdateControl<'_, 'a>, Error> {
+        let req = proto::CtrlMsg_Req_OTABegin {};
+        ioctl!(self, ReqOtaBegin, RespOtaBegin, req, resp);
+        Ok(UpdateControl { control: self })
+    }
+
     /// duration in seconds, clamped to [10, 3600]
     async fn set_heartbeat(&mut self, duration: u32) -> Result<(), Error> {
         let req = proto::CtrlMsg_Req_ConfigHeartbeat {