compile with esp mqtt lib

lib/espMqttClient/src/Packets/RemainingLength.h

@@ -0,0 +1,32 @@
+/*
+Copyright (c) 2022 Bert Melis. All rights reserved.
+
+This work is licensed under the terms of the MIT license.  
+For a copy, see <https://opensource.org/licenses/MIT> or
+the LICENSE file.
+*/
+
+#pragma once
+
+#include <stdint.h>
+
+#include "../Logging.h"
+
+namespace espMqttClientInternals {
+
+// Calculations are based on non normative comment in section 2.2.3 Remaining Length of the MQTT specification
+
+// returns decoded length based on input stream
+// stream is expected to contain full encoded remaining length
+// return -1 on error.
+int32_t decodeRemainingLength(const uint8_t* stream);
+
+
+// returns the number of bytes needed to encode the remaining length
+uint8_t remainingLengthLength(uint32_t remainingLength);
+
+// encodes the given remaining length to destination and returns number of bytes used
+// destination is expected to be large enough to hold the number of bytes needed
+uint8_t encodeRemainingLength(uint32_t remainingLength, uint8_t* destination);
+
+}  // namespace espMqttClientInternals