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Add MQTT 5.0 protocol support #166

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Add MQTT 5.0 protocol support #166

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55cc77a
Add MQTT 5.0 protocol support
usiegj00 Jan 7, 2026
5b0b834
Fix MQTT 5.0 message parsing - pass version to Packet.read
usiegj00 Jan 7, 2026
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11 changes: 7 additions & 4 deletions lib/mqtt/client.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@ class Client
# Port number of the remote server
attr_accessor :port

# The version number of the MQTT protocol to use (default 3.1.1)
# The version number of the MQTT protocol to use (default 5.0)
attr_accessor :version

# Set to true to enable SSL/TLS encrypted communication
Expand Down Expand Up @@ -69,7 +69,7 @@ class Client
ATTR_DEFAULTS = {
:host => nil,
:port => nil,
:version => '3.1.1',
:version => '5.0',
:keep_alive => 15,
:clean_session => true,
:client_id => nil,
Expand Down Expand Up @@ -309,7 +309,7 @@ def disconnect(send_msg = true)

# Close the socket if it is open
if send_msg
packet = MQTT::Packet::Disconnect.new
packet = MQTT::Packet::Disconnect.new(:version => @version)
send_packet(packet)
end
@socket.close unless @socket.nil?
Expand All @@ -328,6 +328,7 @@ def publish(topic, payload = '', retain = false, qos = 0)
raise ArgumentError, 'Topic name cannot be empty' if topic.empty?

packet = MQTT::Packet::Publish.new(
:version => @version,
:id => next_packet_id,
:qos => qos,
:retain => retain,
Expand Down Expand Up @@ -375,6 +376,7 @@ def publish(topic, payload = '', retain = false, qos = 0)
#
def subscribe(*topics)
packet = MQTT::Packet::Subscribe.new(
:version => @version,
:id => next_packet_id,
:topics => topics
)
Expand Down Expand Up @@ -458,6 +460,7 @@ def unsubscribe(*topics)
topics = topics.first if topics.is_a?(Enumerable) && topics.count == 1

packet = MQTT::Packet::Unsubscribe.new(
:version => @version,
:topics => topics,
:id => next_packet_id
)
Expand All @@ -474,7 +477,7 @@ def receive_packet
handle_timeouts
unless result.nil?
# Yes - read in the packet
packet = MQTT::Packet.read(@socket)
packet = MQTT::Packet.read(@socket, version: @version)
handle_packet packet
end
keep_alive!
Expand Down
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