diff --git a/Cargo.toml b/Cargo.toml
index 8048ea0..ffdb00f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,8 +15,8 @@ stm32h7xx-hal = {version = "0.6.0", features = [ "stm32h743v", "rt", "unproven"
 stm32h7-ethernet = { version = "0.2.0", features = [ "phy_lan8742a", "stm32h743v" ] }
 smoltcp = { version = "0.6.0", default-features = false, features = [ "ethernet", "proto-ipv4", "proto-ipv6", "socket-raw" ] }
 nb = "1.0.0"
-scpi = { path = "../scpi-fork/scpi", version = "0.3.4" }
-# scpi = { git = "https://github.com/occheung/scpi-rs", branch = "issue-4" }
+# scpi = { path = "../scpi-fork/scpi", version = "0.3.4" }
+scpi = { git = "https://github.com/occheung/scpi-rs", branch = "issue-4" }
 
 lexical-core = { version="0.7.1", features=["radix"], default-features=false }
 libm = "0.2.0"
diff --git a/src/lib.rs b/src/lib.rs
index fd3219e..a1af640 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -53,6 +53,7 @@ pub enum Error<E> {
 	DDSError,
 	ConfigRegisterError,
 	DDSCLKError,
+	ParameterError,
 }
 
 /*
@@ -142,7 +143,8 @@ where
 
 pub trait UrukulTraits {
 	type Error;
-	fn switch(&mut self, channel: u32) -> Result<(), Self::Error>;
+	fn get_channel_switch_status(&mut self, channel: u32) -> Result<bool, Self::Error>;
+	fn set_channel_switch(&mut self, channel: u32, status: bool) -> Result<(), Self::Error>;
 }
 
 impl<SPI, E> UrukulTraits for Urukul<SPI>
@@ -151,20 +153,52 @@ where
 {
 	type Error = Error<E>;
 
-	fn switch(&mut self, channel: u32) -> Result<(), Self::Error>{
-		if channel < 16 {
-			let switch_set = channel | u32::from(self.config_register.get_status(StatusMask::RF_SW)?);
+	fn get_channel_switch_status(&mut self, channel: u32) -> Result<bool, Self::Error> {
+		if channel < 4 {
+			match self.config_register.get_status(StatusMask::RF_SW) {
+				Ok(val) => Ok((val & (1 << channel)) != 0),
+				Err(_e) => Err(_e),
+			}
+		} else {
+			Err(Error::ParameterError)
+		}
+	}
 
+	fn set_channel_switch(&mut self, channel: u32, status: bool) -> Result<(), Self::Error> {
+		if channel < 4 {
+			let prev = u32::from(self.config_register.get_status(StatusMask::RF_SW)?);
+			let next = {
+				if status {
+					prev | (1 << channel)
+				} else {
+					prev & (!(1 << channel))
+				}
+			};
 			match self.config_register.set_configurations(&mut [
-				(CFGMask::RF_SW, switch_set),
+				(CFGMask::RF_SW, next),
 			]) {
 				Ok(_) => Ok(()),
 				Err(_e) => Err(_e),
 			}
 		} else {
-			Err(Error::ConfigRegisterError)
+			Err(Error::ParameterError)
 		}
 	}
+
+	// fn switch_on(&mut self, channel: u32) -> Result<(), Self::Error>{
+	// 	if channel < 16 {
+	// 		let switch_set = channel | u32::from(self.config_register.get_status(StatusMask::RF_SW)?);
+
+	// 		match self.config_register.set_configurations(&mut [
+	// 			(CFGMask::RF_SW, switch_set),
+	// 		]) {
+	// 			Ok(_) => Ok(()),
+	// 			Err(_e) => Err(_e),
+	// 		}
+	// 	} else {
+	// 		Err(Error::ParameterError)
+	// 	}
+	// }
 }
 
 // /*
diff --git a/src/nal_tcp_client.rs b/src/nal_tcp_client.rs
index 12de105..6e9bf84 100644
--- a/src/nal_tcp_client.rs
+++ b/src/nal_tcp_client.rs
@@ -21,6 +21,7 @@ pub enum NetworkError {
 pub struct NetStorage {
     pub ip_addrs: [net::wire::IpCidr; 1],
     pub neighbor_cache: [Option<(net::wire::IpAddress, net::iface::Neighbor)>; 8],
+    pub routes_cache: [Option<(net::wire::IpCidr, net::iface::Route)>; 8],
 }
 
 pub type NetworkInterface =
diff --git a/src/scpi.rs b/src/scpi.rs
index c08bcd6..8593ecc 100644
--- a/src/scpi.rs
+++ b/src/scpi.rs
@@ -31,7 +31,7 @@ use scpi::{
 use embedded_hal::blocking::spi::Transfer;
 use cortex_m_semihosting::hprintln;
 
-use crate::{Urukul, UrukulTraits};
+use crate::{Urukul, UrukulTraits, Error as UrukulError};
 
 // pub struct MyDevice;
 
@@ -49,39 +49,38 @@ impl<T: Device> Command<T> for HelloWorldCommand {
     }
 }
 
-pub struct SwitchOnCommand {}
-impl<T: Device + UrukulTraits> Command<T> for SwitchOnCommand {
+pub struct Channel1SwitchCommand {}
+impl<T: Device + UrukulTraits> Command<T> for Channel1SwitchCommand {
     nquery!();
 
     fn event(&self, context: &mut Context<T>, args: &mut Tokenizer) -> Result<()> {
-        let mut channel :u32 = 0;
-        let mut channel_index = 0;
-        while true {
-            match args.next_data(channel_index != 0) {
-                Ok(Some(token)) => {
-                    match u32::try_from(token) {
-                        Ok(shift) => {
-                            if shift >= 4 {
-                                return Err(ErrorCode::IllegalParameterValue.into());
-                            }
-                            channel |= (1 << shift);
-                        },
-                        Err(_) => return Err(ErrorCode::IllegalParameterValue.into()),
-                    }
-                },
-                Ok(None) => break,
-                Ok(_) => return Err(ErrorCode::MissingParameter.into()),
-                Err(_e) => return Err(_e),
-            };
-            channel_index += 1;
-        }
-        match context.device.switch(channel) {
-            Ok(()) => Ok(()),
+        match context.device.get_channel_switch_status(1) {
+            Ok(status) => {
+                let next_state: bool = match args.next_data(true) {
+                    Ok(Some(token)) => token.try_into()?,
+                    Ok(None) => !status,
+                    Err(_) => return Err(ErrorCode::IllegalParameterValue.into()),
+                };
+                match context.device.set_channel_switch(1, next_state) {
+                    Ok(()) => Ok(()),
+                    Err(T) => panic!("Switched an illegal channel!"),
+                    Err(_) => Err(Error::new(ErrorCode::HardwareError)),
+                }
+            },
             Err(_) => Err(Error::new(ErrorCode::HardwareError)),
         }
     }
 }
 
+// pub struct SwitchCnannelCommand {}
+// impl<T: Device + UrukulTraits> Command<T> for SwitchChannelCommand {
+//     nquery!();
+
+//     fn event(&self, context: &mut Context<T>, args: &mut Tokenizer) -> Result<()> {
+        
+//     }
+// }
+
 /*
  *  Implement "Device" trait from SCPI
  *  TODO: Implement mandatory commands