Add command structure + packet builder + status command

README.md

@@ -1,4 +1,8 @@
+### CRC Table + base64
+
 I tried to generate the crc8 table, but I can't.
+The table itself is a very long one,
+so I packed base64 encoded it.
 
 At least this one is not working:
 
@@ -50,4 +54,4 @@ crc8_854_table = [
     0x74, 0x2A, 0xC8, 0x96, 0x15, 0x4B, 0xA9, 0xF7,
     0xB6, 0xE8, 0x0A, 0x54, 0xD7, 0x89, 0x6B, 0x35
 ]
-```
+```

lib/client.rb

@@ -46,12 +46,10 @@ def appliance_list
       response['list']
     end
 
-    private
-
     def appliance_transparent_send(appliance_id, data)
       response = api_request(
         'appliance/transparent/send',
-        order: encode(Security.transcode(data).join(',')),
+        order: encode(@security.transcode(data).join(',')),
         funId: '0000',
         applianceId: appliance_id
       )
@@ -61,6 +59,20 @@ def appliance_transparent_send(appliance_id, data)
       response
     end
 
+    def new_packet_builder
+      PacketBuilder.new(@security)
+    end
+
+    private
+
+    def encode(data)
+      @security.aes_encrypt(data, @security.data_key)
+    end
+
+    def decode(data)
+      @security.aes_decrypt(data, @security.data_key)
+    end
+
     def api_request(endpoint, **args)
       args = {
         appId: @app_id, format: FORMAT, clientType: CLIENT_TYPE,

lib/commands/command.rb

@@ -0,0 +1,33 @@
+module MideaAirCondition
+  module Command
+    # Base Command class
+    class BaseCommand
+      # Default device type: 0xAC
+      def initialize(device_type: 0xAC)
+        @data = [0xaa, 0x23, device_type, 0x00, 0x00, 0x00, 0x00, 0x00]
+
+        @data += [
+          0x03, 0x02, 0xff, 0x81, 0x00, 0xff, 0x03, 0xff,
+          0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+        ]
+
+        fill
+      end
+
+      def finalize(security)
+        # Add command sequence number
+        # Can't be lower than 3
+        @data << 0x03
+        @data << security.crc8(@data[0x10..(@data.length - 1)])
+        @data[0x01] = @data.length
+
+        @data
+      end
+
+      private
+
+      def fill; end
+    end
+  end
+end

lib/commands/request_status.rb

@@ -0,0 +1,10 @@
+module MideaAirCondition
+  module Command
+    # Request status of a device
+    class RequestStatus < BaseCommand
+      def fill
+        @data[0x0a] = 0x40
+      end
+    end
+  end
+end

lib/commands/set.rb

@@ -0,0 +1,19 @@
+module MideaAirCondition
+  module Command
+    # Request status of a device
+    class Set < BaseCommand
+      def turn_on
+        @data[0x3] |= 0x1
+      end
+
+      def turn_off
+        @data[0x3] &= 0x1
+      end
+
+      def temperature=(celsius, mode: 2)
+        c = ((mode << 5) & 0xe0) | (celsius & 0xf) | ((celsius << 4) & 0x10)
+        @data[0x04] = c
+      end
+    end
+  end
+end

lib/device.rb

@@ -1,6 +1,8 @@
 module MideaAirCondition
   # Device representation (now only for status parsing)
   class Device
+    attr_reader :data
+
     def initialize(data)
       @data = data
       @pointer = 0x33

lib/midea_air_condition.rb

@@ -1,13 +1,19 @@
 require_relative 'client'
 require_relative 'device'
+require_relative 'packet_builder'
 require_relative 'security'
 require_relative 'version'
 
 # MideaAirCondition namespace
 module MideaAirCondition
+  # Module to deparate command classes
+  module Command
+  end
 end
 
-# path = File.join(File.dirname(__FILE__), 'commands', '*.rb')
-# Dir.glob(path).each do |file|
-#  require file
-# end
+path = File.join(File.dirname(__FILE__), 'commands', 'command.rb')
+require path
+path = File.join(File.dirname(__FILE__), 'commands', '*.rb')
+Dir.glob(path).each do |file|
+  require file
+end

lib/packet_builder.rb

@@ -0,0 +1,54 @@
+module MideaAirCondition
+  # This is where we build our packets
+  class PacketBuilder
+    def initialize(security)
+      @security = security
+      @command = []
+
+      populate_header_data
+
+      # Maybe this one is the client id
+      # In a response it's the device id
+      # and the first six bytes are the same
+      @packet += [0xc6, 0x79, 0x00, 0x00, 0x00, 0x05, 0x0a, 0x00]
+
+      add_unknown_section
+    end
+
+    def add_command(command)
+      raise Exception, 'Invalid argument' if command.is_a?(Command)
+      @command += command.finalize(@security)
+    end
+
+    def finalize
+      @packet += @command
+      @packet << @security.checksum(@command[1..(@command.length - 1)])
+      @packet << 0x00
+
+      # Add padding + update packet length
+      @packet += [0] * (47 - @command.length)
+      @packet[0x04] = @packet.length
+
+      p @packet
+
+      @packet
+    end
+
+    def populate_header_data
+      # was always fix for me except the length byte
+      @packet  = [0x5a, 0x5a, 0x01, 0x11, 0x5c, 0x00, 0x20, 0x00]
+      # was different for status and power
+      # @packet += [0x12, 0x00, 0x00, 0x00, 0x6f, 0x33, 0x0c, 0x00]
+      @packet += [0x01, 0x00, 0x00, 0x00, 0x8d, 0x0f, 0x17, 0x02]
+      # was always fix for me
+      @packet += [0x0e, 0x03, 0x12, 0x14]
+    end
+
+    def add_unknown_section
+      @packet += [
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x02, 0x00, 0x00, 0x00
+      ]
+    end
+  end
+end

lib/security.rb

@@ -49,7 +49,7 @@ def crc8(data)
         k = crc_value ^ m
         k -= 256 if k > 256
         k += 256 if k < 0
-        crc_value = CRC8_854_TABLE[k]
+        crc_value = @crc8_854_table[k]
       end
 
       crc_value