added dBm unit for signal strength

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

2 files changed, 37 insertions, 0 deletions

diff --git a/src/constants.rs b/src/constants.rs
index 30ba4f1..09636ea 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -302,3 +302,6 @@ pub const HA_UNIT_WEIGHT_STONE: &str = "st";
 
 // Light
 pub const HA_UNIT_LIGHT_LUX: &str = "lx";
+
+// Signal Strength
+pub const HA_UNIT_SIGNAL_STRENGTH_DBM: &str = "dBm";
diff --git a/src/unit.rs b/src/unit.rs
index 90eecb4..cf3c5a2 100644
--- a/src/unit.rs
+++ b/src/unit.rs
@@ -73,6 +73,19 @@ impl PressureUnit {
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum SignalStrengthUnit {
+    Dbm,
+}
+
+impl SignalStrengthUnit {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            SignalStrengthUnit::Dbm => crate::constants::HA_UNIT_SIGNAL_STRENGTH_DBM,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum EnergyUnit {
     KiloWattHour,
 }
@@ -442,6 +455,7 @@ pub enum Unit {
     LightLux,
     PressureHectoPascal,
     EnergyKiloWattHour,
+    SignalStrengthDbm,
     TimeMilliseconds,
     TimeSeconds,
     TimeMinutes,
@@ -571,6 +585,7 @@ impl Unit {
             Unit::LightLux => crate::constants::HA_UNIT_LIGHT_LUX,
             Unit::PressureHectoPascal => crate::constants::HA_UNIT_PRESSURE_HPA,
             Unit::EnergyKiloWattHour => crate::constants::HA_UNIT_ENERGY_KWH,
+            Unit::SignalStrengthDbm => crate::constants::HA_UNIT_SIGNAL_STRENGTH_DBM,
             Unit::TimeMilliseconds => crate::constants::HA_UNIT_TIME_MILLISECONDS,
             Unit::TimeSeconds => crate::constants::HA_UNIT_TIME_SECONDS,
             Unit::TimeMinutes => crate::constants::HA_UNIT_TIME_MINUTES,
@@ -750,6 +765,14 @@ impl From<PressureUnit> for Unit {
     }
 }
 
+impl From<SignalStrengthUnit> for Unit {
+    fn from(unit: SignalStrengthUnit) -> Self {
+        match unit {
+            SignalStrengthUnit::Dbm => Unit::SignalStrengthDbm,
+        }
+    }
+}
+
 impl From<EnergyUnit> for Unit {
     fn from(unit: EnergyUnit) -> Self {
         match unit {
@@ -986,6 +1009,17 @@ impl TryFrom<Unit> for PressureUnit {
     }
 }
 
+impl TryFrom<Unit> for SignalStrengthUnit {
+    type Error = UnitConversionError;
+
+    fn try_from(unit: Unit) -> Result<Self, Self::Error> {
+        match unit {
+            Unit::SignalStrengthDbm => Ok(SignalStrengthUnit::Dbm),
+            _ => Err(UnitConversionError),
+        }
+    }
+}
+
 impl TryFrom<Unit> for EnergyUnit {
     type Error = UnitConversionError;