Time-of-Use Controller: improvements (#2475)

- Split ESS CHARGE power limit to "Grid Limit" and "Charge Power Limit"
  - also considers DC-side charging
  - ATTENTION: this requires manual adjustment for Swedish systems to avoid excess power
  - TODO: Grid Limit will eventually be moved to the global "PowerOptimizer" (derivate of Ess.Power)
- Fix error in calculation of sleep time for remainingExecutionLimit
- Improve log output:
  - add actual Params to log
  - nicely format schedule in a table
- Reduce EFFICIENCY_FACTOR to 1.15
- Improve UI visualization

io.openems.common/src/io/openems/common/exceptions/OpenemsError.java

@@ -61,33 +61,33 @@ public enum OpenemsError {
 	JSON_NO_ARRAY_MEMBER(5007, "JSON [%s:%s] is not JSON-Array"), //
 	JSON_NO_DATE_MEMBER(5008, "JONS [%s:%s] is not a Date. Error: %s"), //
 	JSON_NO_STRING(5009, "JSON [%s] is not a String"), //
-	JSON_NO_STRING_MEMBER(5010, "JSON [%s:%s] is not a String"), //
+	JSON_NO_STRING_MEMBER(5010, "JSON [%s:%s] is not a String member"), //
 	JSON_NO_BOOLEAN(5011, "JSON [%s] is not a Boolean"), //
-	JSON_NO_BOOLEAN_MEMBER(5012, "JSON [%s:%s] is not a Boolean"), //
+	JSON_NO_BOOLEAN_MEMBER(5012, "JSON [%s:%s] is not a Boolean member"), //
 	JSON_NO_NUMBER(5013, "JSON [%s] is not a Number"), //
-	JSON_NO_NUMBER_MEMBER(5014, "JSON [%s:%s] is not a Number"), //
+	JSON_NO_NUMBER_MEMBER(5014, "JSON [%s:%s] is not a Number member"), //
 	JSON_PARSE_ELEMENT_FAILED(5015, "JSON failed to parse [%s]. %s: %s"), //
 	JSON_PARSE_FAILED(5016, "JSON failed to parse [%s]: %s"), //
-	JSON_NO_ENUM_MEMBER(5018, "JSON [%s:%s] is not an Enum"), //
+	JSON_NO_ENUM_MEMBER(5018, "JSON [%s:%s] is not an Enum member"), //
 	JSON_NO_INET4ADDRESS(5020, "JSON [%s] is not an IPv4 address"), //
 	JSON_NO_ENUM(5021, "JSON [%s] is not an Enum"), //
 	JSON_NO_FLOAT(5022, "JSON [%s] is not a Float"), //
-	JSON_NO_FLOAT_MEMBER(5030, "JSON [%s:%s] is not a Float"), //
+	JSON_NO_FLOAT_MEMBER(5030, "JSON [%s:%s] is not a Float member"), //
 	JSON_NO_SHORT(5023, "JSON [%s] is not a Short"), //
-	JSON_NO_SHORT_MEMBER(5024, "JSON [%s:%s] is not a Short"), //
+	JSON_NO_SHORT_MEMBER(5024, "JSON [%s:%s] is not a Short member"), //
 	JSON_NO_LONG(5025, "JSON [%s] is not a Short"), //
-	JSON_NO_LONG_MEMBER(5026, "JSON [%s:%s] is not a Short"), //
+	JSON_NO_LONG_MEMBER(5026, "JSON [%s:%s] is not a Short member"), //
 	JSON_NO_DOUBLE(5027, "JSON [%s] is not a Short"), //
-	JSON_NO_DOUBLE_MEMBER(5028, "JSON [%s:%s] is not a Short"), //
+	JSON_NO_DOUBLE_MEMBER(5028, "JSON [%s:%s] is not a Short member"), //
 	JSON_NO_STRING_ARRAY(5029, "JSON [%s] is not a String Array"), //
-	JSON_NO_INET4ADDRESS_MEMBER(5031, "JSON [%s:%s] is not a IPv4 address"), //
+	JSON_NO_INET4ADDRESS_MEMBER(5031, "JSON [%s:%s] is not a IPv4 address member"), //
 	JSON_NO_UUID(5032, "JSON [%s] is not a UUID"), //
-	JSON_NO_UUID_MEMBER(5033, "JSON [%s:%s] is not a UUID"), //
+	JSON_NO_UUID_MEMBER(5033, "JSON [%s:%s] is not a UUID member"), //
 	/*
 	 * XML Errors. 6000-6999
 	 */
 	XML_HAS_NO_MEMBER(6000, "XML [%s] has no member [%s]"), //
-	XML_NO_STRING_MEMBER(6010, "XML [%s:%s] is not a String"), //
+	XML_NO_STRING_MEMBER(6010, "XML [%s:%s] is not a String member"), //
 	;
 
 	/**

io.openems.common/src/io/openems/common/utils/JsonUtils.java

@@ -489,6 +489,58 @@ public static JsonObjectBuilder buildJsonObject(JsonObject j) {
 		return new JsonObjectBuilder(j);
 	}
 
+	/**
+	 * Creates a JsonElement from the {@link Number} value.
+	 *
+	 * @param number the {@link Number}
+	 * @return a {@link JsonPrimitive} or {@link JsonNull}
+	 */
+	public static JsonElement toJson(Number number) {
+		if (number == null) {
+			return JsonNull.INSTANCE;
+		}
+		return new JsonPrimitive(number);
+	}
+
+	/**
+	 * Creates a JsonElement from the {@link Boolean} value.
+	 *
+	 * @param bool the {@link Boolean}
+	 * @return a {@link JsonPrimitive} or {@link JsonNull}
+	 */
+	public static JsonElement toJson(Boolean bool) {
+		if (bool == null) {
+			return JsonNull.INSTANCE;
+		}
+		return new JsonPrimitive(bool);
+	}
+
+	/**
+	 * Creates a JsonElement from the {@link Boolean} value.
+	 *
+	 * @param c the {@link Character}
+	 * @return a {@link JsonPrimitive} or {@link JsonNull}
+	 */
+	public static JsonElement toJson(Character c) {
+		if (c == null) {
+			return JsonNull.INSTANCE;
+		}
+		return new JsonPrimitive(c);
+	}
+
+	/**
+	 * Creates a JsonElement from the {@link Boolean} value.
+	 *
+	 * @param string the {@link String}
+	 * @return a {@link JsonPrimitive} or {@link JsonNull}
+	 */
+	public static JsonElement toJson(String string) {
+		if (string == null) {
+			return JsonNull.INSTANCE;
+		}
+		return new JsonPrimitive(string);
+	}
+
 	/**
 	 * Gets the {@link JsonElement} as {@link JsonPrimitive}.
 	 *
@@ -1698,6 +1750,21 @@ public static JsonElement parse(String string) throws OpenemsNamedException {
 		}
 	}
 
+	/**
+	 * Parses a string to a {@link Optional} {@link JsonElement}.
+	 * 
+	 * @param string to be parsed
+	 * @return the {@link Optional} of the result; {@link Optional#empty()} if the
+	 *         value can not be parsed
+	 */
+	public static Optional<JsonElement> parseOptional(String string) {
+		try {
+			return Optional.of(JsonParser.parseString(string));
+		} catch (JsonParseException e) {
+			return Optional.empty();
+		}
+	}
+
 	/**
 	 * Parses a string to a {@link JsonObject}.
 	 *