Add multi-block support (#53)

This change adds support for multiple block
requests and receives. A sequence of up to
NUM_OF_BLOCKS_REQUESTED will be requested
which are sequential in block number if
still needed. Upon receiving the OTA agent
will determine if the block is needed.

CMakeLists.txt

@@ -42,7 +42,7 @@ FetchContent_Declare(
 FetchContent_Declare(
   iot-core-mqtt-file-downloader
   GIT_REPOSITORY https://github.com/aws/aws-iot-core-mqtt-file-streams-embedded-c/
-  GIT_TAG 7264c7115de5b02aacf5430554cc2c7428b43d24)
+  GIT_TAG 690fb2bd10020da916fe54f3e8c59f1e3f925e44)
 FetchContent_Declare(
   jobs
   GIT_REPOSITORY https://github.com/aws/Jobs-for-AWS-IoT-embedded-sdk.git
@@ -125,7 +125,8 @@ target_compile_options(iot-core-mqtt-file-downloader PRIVATE -std=c99 -pedantic)
 target_link_libraries(iot-core-mqtt-file-downloader
                       PUBLIC coreJSON coreMQTT mqtt_wrapper tinycbor)
 target_include_directories(iot-core-mqtt-file-downloader
-                           PUBLIC ${MQTT_FILE_DOWNLOADER_INCLUDES})
+                           PUBLIC ${MQTT_FILE_DOWNLOADER_INCLUDES}
+                            "${CMAKE_CURRENT_LIST_DIR}/cfg/MqttStreams")
 
 add_executable(
   coreOTA_Demo

cfg/MqttStreams/MQTTFileDownloader_config.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright Amazon.com, Inc. and its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT
+ *
+ * Licensed under the MIT License. See the LICENSE accompanying this file
+ * for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+#ifndef MQTT_FILE_DOWNLOADER_CONFIG_H
+#define MQTT_FILE_DOWNLOADER_CONFIG_H
+
+#include <stdint.h>
+
+#define mqttFileDownloader_CONFIG_BLOCK_SIZE    256U
+
+#endif /* #ifndef MQTT_FILE_DOWNLOADER_CONFIG_H */