Add controller capabilities reader

src/main/java/com/litoralregas/backend/acquisition/ControllerCapabilities.java

@@ -0,0 +1,15 @@
+package com.litoralregas.backend.acquisition;
+
+import java.time.Instant;
+
+public record ControllerCapabilities(
+        Integer irrigationControllerCount,
+        Integer fertilizerChannelCount,
+        Boolean irrigationEnabled,
+        Boolean climateEnabled,
+        Boolean lightingEnabled,
+        Integer climateGreenhouseCount,
+        Integer rawFeatureFlags,
+        Instant timestamp
+) {
+}

src/main/java/com/litoralregas/backend/acquisition/ControllerCapabilitiesController.java

@@ -0,0 +1,19 @@
+package com.litoralregas.backend.acquisition;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class ControllerCapabilitiesController {
+
+    private final ControllerCapabilitiesReader controllerCapabilitiesReader;
+
+    public ControllerCapabilitiesController(ControllerCapabilitiesReader controllerCapabilitiesReader) {
+        this.controllerCapabilitiesReader = controllerCapabilitiesReader;
+    }
+
+    @GetMapping("/api/acquisition/capabilities")
+    public ControllerCapabilities getCapabilities() {
+        return controllerCapabilitiesReader.readCapabilities();
+    }
+}

src/main/java/com/litoralregas/backend/acquisition/ControllerCapabilitiesReader.java

@@ -0,0 +1,56 @@
+package com.litoralregas.backend.acquisition;
+
+import com.litoralregas.backend.modbus.LrModbusClient;
+import com.litoralregas.backend.modbus.ModbusReadResult;
+import com.litoralregas.backend.modbus.ModbusUnit;
+import org.springframework.stereotype.Service;
+
+import java.time.Instant;
+import java.util.List;
+
+@Service
+public class ControllerCapabilitiesReader {
+
+    private static final int CAPABILITIES_START_ADDRESS = 6;
+    private static final int CAPABILITIES_REGISTER_COUNT = 4;
+
+    private final LrModbusClient modbusClient;
+
+    public ControllerCapabilitiesReader(LrModbusClient modbusClient) {
+        this.modbusClient = modbusClient;
+    }
+
+    public ControllerCapabilities readCapabilities() {
+        ModbusReadResult result = modbusClient.readInputRegisters(
+                ModbusUnit.PC,
+                CAPABILITIES_START_ADDRESS,
+                CAPABILITIES_REGISTER_COUNT
+        );
+
+        List<Integer> values = result.values();
+
+        if (values.size() != CAPABILITIES_REGISTER_COUNT) {
+            throw new IllegalStateException("Invalid controller capabilities response size.");
+        }
+
+        Integer irrigationControllerCount = values.get(0);
+        Integer fertilizerChannelCount = values.get(1);
+        Integer rawFeatureFlags = values.get(2);
+        Integer climateGreenhouseCount = values.get(3);
+
+        return new ControllerCapabilities(
+                irrigationControllerCount,
+                fertilizerChannelCount,
+                isBitSet(rawFeatureFlags, 0),
+                isBitSet(rawFeatureFlags, 1),
+                isBitSet(rawFeatureFlags, 2),
+                climateGreenhouseCount,
+                rawFeatureFlags,
+                Instant.now()
+        );
+    }
+
+    private boolean isBitSet(Integer value, int bitOffset) {
+        return ((value >> bitOffset) & 1) == 1;
+    }
+}