diff --git a/server/texture-sync-server/src/model/sha256.rs b/server/texture-sync-server/src/model/sha256.rs
index 7397836..09be459 100644
--- a/server/texture-sync-server/src/model/sha256.rs
+++ b/server/texture-sync-server/src/model/sha256.rs
@@ -1,7 +1,7 @@
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 
 #[derive(Clone, Debug, Deserialize, Serialize, Eq, PartialEq)]
-pub struct Sha256(#[serde(serialize_with = "as_hex", deserialize_with = "from_hex")] [u8; 32]);
+pub struct Sha256(#[serde(serialize_with = "as_hex", deserialize_with = "from_hex")] pub [u8; 32]);
 
 fn as_hex<S>(hash: &[u8; 32], serializer: S) -> Result<S::Ok, S::Error>
 where
diff --git a/server/texture-sync-server/src/protocol/implementation/mod.rs b/server/texture-sync-server/src/protocol/implementation/mod.rs
index f0b5c10..fe1d13e 100644
--- a/server/texture-sync-server/src/protocol/implementation/mod.rs
+++ b/server/texture-sync-server/src/protocol/implementation/mod.rs
@@ -46,13 +46,28 @@ where
                 // Just clone the connection.
                 break;
             }
+
             Package::Binary(_) => {
                 connection.send(&Package::Error(400, "Unexpected Binary".to_string()))?;
                 break;
             }
+
+            Package::JsonTrue | Package::JsonFalse | Package::JsonNull => {
+                connection.send(&Package::Error(
+                    400,
+                    "Unexpected true, false or null. ".to_string(),
+                ))?;
+                break;
+            }
+
             Package::Json(Command::Ping {}) => {
                 connection.send(&Package::Json(Command::Pong {}))?;
             }
+
+            Package::Json(Command::Pong {}) => {
+                // Ignore
+            }
+
             // TODO: lots
             _ => unimplemented!(),
         }
diff --git a/server/texture-sync-server/src/protocol/implementation/protocol_connection.rs b/server/texture-sync-server/src/protocol/implementation/protocol_connection.rs
index 4e7f1bb..7961d3c 100644
--- a/server/texture-sync-server/src/protocol/implementation/protocol_connection.rs
+++ b/server/texture-sync-server/src/protocol/implementation/protocol_connection.rs
@@ -69,6 +69,12 @@ impl<R: Read + Sized, W: Write + Sized> Connection<R, W> {
         Connection { reader, writer }
     }
 
+    #[cfg(test)]
+    pub fn destruct(self) -> (R, W) {
+        let Connection { reader, writer } = self;
+        (reader, writer)
+    }
+
     pub fn receive(&mut self) -> Result<Package> {
         let mut payload_type_buffer = [0u8; 1];
         let mut reserved_buffer = [0u8; 3];
@@ -172,7 +178,52 @@ impl<R: Read + Sized, W: Write + Sized> Connection<R, W> {
     }
 
     pub fn send(&mut self, pkg: &Package) -> Result<()> {
-        unimplemented!()
+        match pkg {
+            Package::JsonNull => self.send_json(&Option::<bool>::None),
+            Package::JsonTrue => self.send_json(&true),
+            Package::JsonFalse => self.send_json(&false),
+            Package::Json(cmd) => self.send_json(cmd),
+
+            Package::Binary(bin) => self.send_binary(bin),
+            Package::Error(code, msg) => self.send_error(*code, msg),
+        }
+    }
+
+    fn send_json<J: 'static + Serialize + Sized>(&mut self, msg: &J) -> Result<()> {
+        let w = &mut self.writer;
+
+        let payload = serde_json::to_vec(msg).unwrap();
+
+        w.write_all(&[PACKAGE_TYPE_JSON, 42, 42, 42])?;
+        w.write_all(&(payload.len() as u32).to_be_bytes())?;
+
+        w.write_all(&payload[..])?;
+
+        w.flush()
+    }
+
+    fn send_binary(&mut self, payload: &[u8]) -> Result<()> {
+        let w = &mut self.writer;
+
+        w.write_all(&[PACKAGE_TYPE_BIN, 42, 42, 42])?;
+        w.write_all(&(payload.len() as u32).to_be_bytes())?;
+
+        w.write_all(payload)?;
+
+        w.flush()
+    }
+
+    fn send_error(&mut self, code: u16, msg: &str) -> Result<()> {
+        let w = &mut self.writer;
+
+        let payload = format!("{:03} {}", code, msg).into_bytes();
+
+        w.write_all(&[PACKAGE_TYPE_ERROR, 42, 42, 42])?;
+        w.write_all(&(payload.len() as u32).to_be_bytes())?;
+
+        w.write_all(&payload[..])?;
+
+        w.flush()
     }
 }
 
@@ -180,6 +231,26 @@ impl<R: Read + Sized, W: Write + Sized> Connection<R, W> {
 mod test {
     use super::*;
 
+    use crate::model::*;
+
+    // Utility fn
+
+    fn test_read_back(pkg: &Package) {
+        let dummy_read_data = [255u8];
+
+        // generate write
+        let mut c = Connection::new(&dummy_read_data[..], Vec::new());
+        c.send(&pkg).unwrap();
+
+        let (_, written) = c.destruct();
+
+        // read back in
+        let mut c = Connection::new(&written[..], Vec::new() /*dummy*/);
+        let read_back_pkg = c.receive().unwrap();
+
+        assert_eq!(&read_back_pkg, pkg)
+    }
+
     #[test]
     fn read_error_good() {
         let mut read_data = Vec::new();
@@ -236,8 +307,6 @@ mod test {
     // we don't test the actual json parsing here,
     // since serde_json is well tested.
 
-    // AndTesting the declaration seams not worth the effort.
-
     #[test]
     fn read_json_good() {
         let mut read_data = Vec::new();
@@ -301,4 +370,17 @@ mod test {
 
         assert_eq!(c.receive().is_err(), true);
     }
+
+    #[test]
+    fn writes() {
+        test_read_back(&Package::JsonNull);
+        test_read_back(&Package::JsonFalse);
+        test_read_back(&Package::JsonTrue);
+
+        test_read_back(&Package::Json(Command::Pong {}));
+
+        test_read_back(&Package::Error(500, "I bims 1 Error".to_string()));
+
+        test_read_back(&Package::Binary(vec![42u8; 50000]));
+    }
 }