Log Message:
ndpi: updated to 2.4

2.4 Stable:
New Supported Protocols and Services
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Showmax.com
Musical.ly
RapidVideo
VidTO streaming service
Apache JServ Protocol
Facebook Messenger
FacebookZero protocol

Improvements
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Improved YouTube support
Improved Netflix support
Updated Google Hangout detection
Updated Twitter address range
Updated Viber ports, subnet and domain
Updated AmazonVideo detection
Updated list of FaceBook sites
Initial Skype in/out support
Improved Tor detection
Improved hyperscan support and category definition
Custom categories loading, extended ndpiReader (-c <file>) for loading \ 
name-based categories

Fixes
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Fixes for Instagram flows classified as Facebook
Fixed Spotify detection
Fixed minimum packet payload length for SSDP
Fixed length check in MSN, x-steam-sid, Tor certificate name
Increase client's maximum payload length for SSH
Fixed end-of-line bounds handling
Fixed substring matching
Fix for handling IP address based custom categories
Repaired wrong timestamp calculation
Fixed memory leak
Optimized memory usage

Other/Changes
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New API calls:
ndpi_set_detection_preferences()
ndpi_load_hostname_category()
ndpi_enable_loaded_categories()
ndpi_fill_protocol_category()
ndpi_process_extra_packet()
Skype CallIn/CallOut are now set as Skype.SkypeCallOut Skype.SkypeCallIn
Added support for SMTPS on port 587
Changed RTP from VoIP to Media category
Added site unavailable category
Added custom categories CUSTOM_CATEGORY_MINING, CUSTOM_CATEGORY_MALWARE, \ 
CUSTOM_CATEGORY_ADVERTISEMENT, CUSTOM_CATEGORY_BANNED_SITE
Implemented hash-based categories
Converted some not popular protocols to NDPI_PROTOCOL_GENERIC with category detection