Add comments on TCP client development

src/net/cmd_handler.rs

@@ -163,6 +163,10 @@ pub struct TecSetICmd {
     json: TecSetICmdJson
 }
 
+/// Miniconf is very slow in debug builds (~3-4ms of cmd decoding time).
+///     Make sure kirdy's firmware is flashed with release builds.
+/// The received message must contain only one json cmd. TCP client should set TCP_NODELAY or equivalent flag in its TCP Socket 
+///     Settings to avoid unwanted buffering on TX Data and minimize TX latency.
 pub fn execute_cmd(buffer: &mut [u8], buffer_size: usize, mut laser: LdDrive, mut tec: Thermostat, mut device_settings: DeviceSettings)->(LdDrive, Thermostat, bool, DeviceSettings){
     let mut should_reset = false;