add reply API for client

Cargo.toml

 [package]
 name = "coap"
-version = "0.2.0"
+version = "0.2.1"
 description = "A CoAP library"
 readme = "README.md"
 documentation = "http://covertness.github.io/coap-rs/coap/index.html"

README.md

@@ -17,7 +17,7 @@ First add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-coap = "0.2.0"
+coap = "0.2.1"
 ```
 
 Then, add this to your crate root:

examples/client_and_server.rs

@@ -4,18 +4,8 @@ use coap::packet::*;
 use coap::{CoAPServer, CoAPClient};
 
 fn request_handler(req: Packet, resp: CoAPClient) {
-	let uri_path = req.get_option(OptionType::UriPath);
-	assert!(uri_path.is_some());
-	let uri_path = uri_path.unwrap();
-	let mut packet = Packet::new();
-
-	packet.header.set_version(1);
-	packet.header.set_type(PacketType::Acknowledgement);
-	packet.header.set_code("2.05");
-	packet.header.set_message_id(req.header.get_message_id());
-	packet.set_token(req.get_token().clone());
-	packet.payload = uri_path.front().unwrap().clone();
-	resp.send(&packet).unwrap();
+	let uri_path = req.get_option(OptionType::UriPath).unwrap();
+	resp.reply(&req, uri_path.front().unwrap().clone()).unwrap();
 }
 
 fn main() {

src/client.rs

@@ -88,6 +88,24 @@ impl CoAPClient {
 		}
 	}
 
+	/// Response the client with the specifc payload.
+	pub fn reply(&self, request_packet: &Packet, payload: Vec<u8>) -> Result<()> {
+		let mut packet = Packet::new();
+
+		packet.header.set_version(1);
+		let response_type = match request_packet.header.get_type() {
+			PacketType::Confirmable => PacketType::Acknowledgement,
+			PacketType::NonConfirmable => PacketType::NonConfirmable,
+			_ => return Err(Error::new(ErrorKind::InvalidInput, "request type error"))
+		};
+		packet.header.set_type(response_type);
+		packet.header.set_code("2.05");
+		packet.header.set_message_id(request_packet.header.get_message_id());
+		packet.set_token(request_packet.get_token().clone());
+		packet.payload = payload;
+		self.send(&packet)
+	}
+
 	/// Execute a request.
 	pub fn send(&self, packet: &Packet) -> Result<()> {
 		match packet.to_bytes() {

src/lib.rs

@@ -10,7 +10,7 @@
 //! 
 //! ```toml
 //! [dependencies]
-//! coap = "0.2.0"
+//! coap = "0.2.1"
 //! ```
 //! 
 //! Then, add this to your crate root:

src/server.rs

@@ -146,15 +146,8 @@ mod test {
 		let uri_path = req.get_option(OptionType::UriPath);
 		assert!(uri_path.is_some());
 		let uri_path = uri_path.unwrap();
-		let mut packet = Packet::new();
 
-		packet.header.set_version(1);
-		packet.header.set_type(PacketType::Acknowledgement);
-		packet.header.set_code("2.05");
-		packet.header.set_message_id(req.header.get_message_id());
-		packet.set_token(req.get_token().clone());
-		packet.payload = uri_path.front().unwrap().clone();
-		resp.send(&packet).unwrap();
+		resp.reply(&req, uri_path.front().unwrap().clone()).unwrap();
 	}
 
 	#[test]