diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 0e38bac..3dbfc9c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -21,7 +21,7 @@ repos:
 
       - id: test
         name: cargo test
-        entry: cargo test --all
+        entry: cargo test --all --features hardware-tests -- --include-ignored
         language: system
         pass_filenames: false
         stages: [pre-push]
diff --git a/Cargo.lock b/Cargo.lock
index b2e0887..2d48b33 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,10 +2,17 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "dotenvy"
+version = "0.15.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
+
 [[package]]
 name = "dsp_thomann"
 version = "0.1.0"
 dependencies = [
+ "dotenvy",
  "strum",
  "strum_macros",
  "thiserror",
diff --git a/Cargo.toml b/Cargo.toml
index ecb8674..f09719d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,9 @@ name = "dsp_thomann"
 version = "0.1.0"
 edition = "2024"
 
+[dev-dependencies]
+dotenvy = "0.15"
+
 [dependencies]
 thiserror = "2.0.19"
 strum = "0.28.0"
@@ -10,4 +13,7 @@ strum_macros = "0.28.0"
 
 [lib]
 name = "dsp_thomann"
-path = "src/lib.rs"
\ No newline at end of file
+path = "src/lib.rs"
+
+[features]
+hardware-tests = []
\ No newline at end of file
diff --git a/src/dsp408/client/dsp408.rs b/src/dsp408/client/dsp408.rs
index e50a4f6..b4ff180 100644
--- a/src/dsp408/client/dsp408.rs
+++ b/src/dsp408/client/dsp408.rs
@@ -1427,3 +1427,256 @@ impl fmt::Debug for DSP408 {
             .finish()
     }
 }
+
+#[cfg(feature = "hardware-tests")]
+#[test]
+fn full_command_sweep_against_real_hardware() {
+    use std::sync::Once;
+    use std::{env, str::FromStr};
+
+    static INIT: Once = Once::new();
+
+    fn init_test_env() {
+        INIT.call_once(|| {
+            dotenvy::dotenv().ok();
+        });
+    }
+
+    fn dsp_host() -> IpAddr {
+        IpAddr::from_str(&env::var("DSP_HOST").unwrap_or_else(|_| "192.168.49.30".into()))
+            .expect("DSP_HOST must be a valid IP")
+    }
+
+    fn dsp_port() -> u16 {
+        env::var("DSP_PORT")
+            .ok()
+            .and_then(|v| v.parse().ok())
+            .unwrap_or(9761)
+    }
+
+    fn dsp_device_id() -> u8 {
+        env::var("DSP_DEVICE_ID")
+            .ok()
+            .and_then(|v| v.parse().ok())
+            .unwrap_or(1)
+    }
+
+    fn destructive_allowed() -> bool {
+        matches!(
+            env::var("DSP_ALLOW_DESTRUCTIVE")
+                .unwrap_or_default()
+                .as_str(),
+            "1" | "true" | "yes"
+        )
+    }
+
+    init_test_env();
+
+    let host = dsp_host();
+    let port = dsp_port();
+    let device_id = dsp_device_id();
+
+    let mut dsp = DSP408::new(host, port, device_id).expect("invalid connection params");
+
+    // ---------- Connect ----------
+    dsp.connect().expect("connect() should succeed");
+    assert!(
+        dsp.connected(),
+        "device should report connected after connect()"
+    );
+
+    {
+        let state = dsp
+            .state()
+            .expect("state should be populated after connect");
+        assert!(!state.name.is_empty(), "device name should be non-empty");
+        assert!(
+            !state.presets.names.is_empty(),
+            "preset name list should be populated"
+        );
+        assert!(
+            !state.current_config.input_states.is_empty(),
+            "input map should be populated"
+        );
+        assert!(
+            !state.current_config.output_states.is_empty(),
+            "output map should be populated"
+        );
+    }
+
+    // ---------- Delay unit ----------
+    let ok = dsp
+        .set_delay_unit(types::DelayUnit::Millisecond)
+        .expect("set_delay_unit");
+    assert!(ok);
+    assert_eq!(
+        dsp.state().unwrap().current_config.delay_unit,
+        types::DelayUnit::Millisecond
+    );
+
+    // ---------- Input channel exercise ----------
+    let input = types::InputChannel::InA;
+    let in_ch = types::Channel::Input(input);
+
+    let ok = dsp.set_mute(in_ch, true).expect("set_mute");
+    assert!(ok);
+    assert!(dsp.state().unwrap().current_config.input_states[&input].mute);
+
+    let ok = dsp.set_mute(in_ch, false).expect("unmute");
+    assert!(ok);
+    assert!(!dsp.state().unwrap().current_config.input_states[&input].mute);
+
+    let ok = dsp.set_channel_gain(in_ch, -3.0).expect("set_channel_gain");
+    assert!(ok);
+    assert!((dsp.state().unwrap().current_config.input_states[&input].gain - (-3.0)).abs() < 0.01);
+
+    let ok = dsp
+        .set_channel_inverse_gain(in_ch, true)
+        .expect("set_channel_inverse_gain");
+    assert!(ok);
+    assert!(dsp.state().unwrap().current_config.input_states[&input].phase_inverted);
+    dsp.set_channel_inverse_gain(in_ch, false)
+        .expect("revert phase");
+
+    let ok = dsp
+        .set_channel_delay(in_ch, 1.5, types::DelayUnit::Millisecond)
+        .expect("set_channel_delay");
+    assert!(ok);
+
+    let ok = dsp
+        .set_channel_name(in_ch, "Test InA")
+        .expect("set_channel_name");
+    assert!(ok);
+    assert_eq!(
+        dsp.state().unwrap().current_config.input_states[&input].name,
+        "Test InA"
+    );
+
+    let ok = dsp
+        .set_low_pass(in_ch, 120.0, types::CrossoverFilter::Bw24)
+        .expect("set_low_pass");
+    assert!(ok);
+
+    let ok = dsp
+        .set_high_pass(in_ch, 80.0, types::CrossoverFilter::Bw24)
+        .expect("set_high_pass");
+    assert!(ok);
+
+    let ok = dsp
+        .set_peq_band(
+            in_ch,
+            types::PEQBand::B1,
+            2.0,
+            1000.0,
+            1.0,
+            types::PEQFilter::Peak,
+            false,
+        )
+        .expect("set_peq_band");
+    assert!(ok);
+
+    let ok = dsp.set_bypass_peq(in_ch, true).expect("set_bypass_peq");
+    assert!(ok);
+    dsp.set_bypass_peq(in_ch, false).expect("un-bypass peq");
+
+    let ok = dsp.set_gate(input, -40.0, 5, 100, 200).expect("set_gate");
+    assert!(ok);
+
+    let ok = dsp
+        .set_geq_band(input, types::DiscreteFrequency::F100, 1.0)
+        .expect("set_geq_band");
+    assert!(ok);
+
+    let ok = dsp.set_geq_bypass(input, true).expect("set_geq_bypass");
+    assert!(ok);
+    dsp.set_geq_bypass(input, false).expect("un-bypass geq");
+
+    let ok = dsp
+        .set_input_source(types::InputSource {
+            r#type: types::InputType::Analog,           // adjust to your enum
+            frequency: types::DiscreteFrequency::F1000, // adjust to your enum
+        })
+        .expect("set_input_source");
+    assert!(ok);
+
+    // // ---------- Output channel exercise ----------
+    let output = types::OutputChannel::Out1;
+    let out_ch = types::Channel::Output(output);
+
+    let ok = dsp
+        .set_compressor(output, types::Ratio::Limit, 5, 50, 2, -12.0)
+        .expect("set_compressor");
+    assert!(ok);
+
+    let ok = dsp.set_limiter(output, -3.0, 1, 50).expect("set_limiter");
+    assert!(ok);
+
+    let ok = dsp
+        .set_matrix_gain(input, output, -6.0)
+        .expect("set_matrix_gain");
+    assert!(ok);
+
+    let ok = dsp
+        .set_matrix_routing(output, vec![input])
+        .expect("set_matrix_routing");
+    assert!(ok);
+    assert_eq!(
+        dsp.state().unwrap().current_config.output_states[&output]
+            .matrix_routes
+            .connected,
+        vec![input]
+    );
+
+    // // ---------- Copy / link channels ----------
+    let other_output = types::OutputChannel::Out2;
+    let ok = dsp
+        .copy_channel(out_ch, types::Channel::Output(other_output))
+        .expect("copy_channel");
+    assert!(ok);
+
+    let ok = dsp
+        .link_channels(out_ch, vec![types::Channel::Output(other_output)])
+        .expect("link_channels");
+    assert!(ok);
+
+    // // ---------- Preset name / modification status ----------
+    let ok = dsp
+        .set_current_preset_name("Integration Te")
+        .expect("set_current_preset_name");
+    assert!(ok);
+
+    let status = dsp
+        .get_preset_modification_status()
+        .expect("get_preset_modification_status");
+    println!("Preset modification status: {:?}", status);
+
+    let name = dsp.get_preset_name(1).expect("get_preset_name");
+    println!("Preset 1 name: {}", name);
+
+    // // ---------- Meters ----------
+    let meters = dsp.get_meter_levels().expect("get_meter_levels");
+    println!("Meters: {:?}", meters);
+
+    // // ---------- Destructive ops (opt-in only) ----------
+    if destructive_allowed() {
+        let ok = dsp
+            .store_current_configuration(1, false)
+            .expect("store_current_configuration");
+        assert!(ok);
+        assert!(dsp.state().unwrap().presets.modified[1]);
+
+        let ok = dsp.recall_preset(1).expect("recall_preset");
+        assert!(ok);
+        assert_eq!(dsp.state().unwrap().presets.current_index, 1);
+
+        // factory_reset intentionally left commented out — wipes the unit.
+        // let ok = dsp.factory_reset(true).expect("factory_reset");
+        // assert!(ok);
+    } else {
+        println!("Skipping destructive ops (set DSP_ALLOW_DESTRUCTIVE=1 to enable)");
+    }
+
+    // ---------- Disconnect ----------
+    dsp.disconnect();
+    assert!(!dsp.connected(), "device should report disconnected");
+}
diff --git a/src/dsp408/types.rs b/src/dsp408/types.rs
index e9035df..773dcbe 100644
--- a/src/dsp408/types.rs
+++ b/src/dsp408/types.rs
@@ -354,13 +354,13 @@ pub struct DSPConfigState {
 }
 
 impl DSPConfigState {
-    pub fn input_state_mut(&mut self, channel: InputChannel) -> &mut InputChannelState {
+    pub(crate) fn input_state_mut(&mut self, channel: InputChannel) -> &mut InputChannelState {
         self.input_states
             .get_mut(&channel)
             .expect("Invalid input channel state")
     }
 
-    pub fn output_state_mut(&mut self, channel: OutputChannel) -> &mut OutputChannelState {
+    pub(crate) fn output_state_mut(&mut self, channel: OutputChannel) -> &mut OutputChannelState {
         self.output_states
             .get_mut(&channel)
             .expect("Invalid output channel state")