Support HTTPS connection between client and server

Background

• Current software update mechanism doesn't support HTTPS connection between client and server.

Description

• Support HTTPS connection between client and server.
• According to Quirin, HTTPS works if the following SWUpdate's build configs are added:

  CONFIG_CURL=y
  CONFIG_CURL_SSL=y
  CONFIG_SSL_IMPL_OPENSSL=y
  CONFIG_DOWNLOAD=y
  CONFIG_DOWNLOAD_SSL=y
  CONFIG_CHANNEL_CURL=y
  CONFIG_CHANNEL_CURL_SSL=y
  CONFIG_SURICATTA=y
  CONFIG_SURICATTA_STATE_CHOICE_NONE=y
  CONFIG_SURICATTA_HAWKBIT=y
  CONFIG_SURICATTA_SSL=y
  CONFIG_HASH_VERIFY=y
  CONFIG_JSON=y

  • NOTE: Need to check them because some configs may not be necessary.

Goal

• Investigate how to connect client and server with HTTPS
• Implement HTTPS connection between client and server
• Test the feature