Fix resetting of timeout when ACK is not received

This was uncovered by the cli tools lack of ACK response

examples/cli.rs

@@ -20,6 +20,7 @@ fn main() {
     loop {
         inquire_and_send_command(&mut serial, &scheduler_path).unwrap();
         println!("------------------------");
+        std::thread::sleep(Duration::from_millis(100));
     }
 }
 
@@ -130,6 +131,7 @@ fn inquire_and_send_command(edu: &mut impl CommunicationHandle, path: &str) -> R
             match edu.receive_multi_packet() {
                 Ok(data) => {
                     std::fs::write(result_path, data)?;
+                    edu.send_packet(&CEPPacket::Ack)?;
                     println!("Wrote result to file");
                 },
                 Err(e) => println!("Received {:?}", e),

src/communication/mod.rs

@@ -115,12 +115,13 @@ pub trait CommunicationHandle: Read + Write {
     /// Try to receive an ACK packet with a given `timeout`. Resets the timeout to Duration::MAX afterwards
     fn await_ack(&mut self, timeout: Duration) -> ComResult<()> {
         self.set_timeout(timeout);
-        let ret = match self.receive_packet()? {
+        let result = self.receive_packet();
+        self.set_timeout(Self::UNLIMITED_TIMEOUT);
+        let ret = match result? {
             CEPPacket::Ack => Ok(()),
             CEPPacket::Nack => Err(CommunicationError::NotAcknowledged),
             _ => Err(CommunicationError::PacketInvalidError),
         };
-        self.set_timeout(Self::UNLIMITED_TIMEOUT);
         ret
     }
 }