feat: add Modbus support

scripts/update_modbus_registers.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+
+# Update modbus parameters from entity definitions.
+# This script generates c++ code for the modbus parameter definitions.
+#
+# Run this script from the EMS-ESP32 root directory with the command `scripts/update_modbus_registers.sh`.
+
+while [[ $# -gt 0 ]]; do
+  case $1 in
+    --reset)
+      RESET=YES
+      shift
+      ;;
+    --force)
+      FORCE=YES
+      shift
+      ;;
+    *|-*|--*)
+      echo "Unknown option $1"
+      exit 1
+      ;;
+  esac
+done
+
+if [ "$RESET" = "YES" ]; then
+  if [ "$FORCE" != "YES" ]; then
+    read -p  "Are you sure you want to reset all modbus entity parameters, potentially generating new register mappings? WARNING: This might introduce breaking changes for end users. [yes/no] " CONFIRMATION
+    if [ "$CONFIRMATION" != "yes" ]; then
+      echo "Aborted."
+      exit 1
+    fi
+  fi
+  echo "Resetting modbus configuration"
+  cat >./src/modbus_entity_parameters.hpp <<EOL
+#include "modbus.h"
+#include "emsdevice.h"
+
+namespace emsesp {
+
+using dt = EMSdevice::DeviceType;
+
+#define REGISTER_MAPPING(device_type, device_value_tag_type, long_name, modbus_register_offset, modbus_register_count) \\
+    { device_type, device_value_tag_type, long_name[0], modbus_register_offset, modbus_register_count }
+
+// IMPORTANT: This list MUST be ordered by keys "device_type", "device_value_tag_type" and "modbus_register_offset" in this order.
+const std::initializer_list<Modbus::EntityModbusInfo> Modbus::modbus_register_mappings = {};
+
+} // namespace emsesp
+EOL
+fi
+
+make clean
+make ARGS=-DEMSESP_STANDALONE
+echo "test entity_dump" | ./emsesp | python3 ./scripts/strip_csv.py | python3 ./scripts/update_modbus_registers.py > ./src/modbus_entity_parameters.hpp
+echo "Modbus entity parameters written to ./src/modbus_entity_parameters.hpp."