Lonhand客户端库
lonhand的Python项目详细描述
Lonhand客户端库
USR IOT实现USR-WP1智能插座（单通道继电器）的Lonhand协议。
用法：
from lonhand import device
# create switch
switch = WifiRelay('192.168.1.23')
# turn on
switch.turn_on()
# get state
state = switch.is_on()
# turn off
switch.turn_off()
协议
命令：
55 AA - distinguishes a command, unlike for example the password which
should be sent as is (with suffix 0D 0A)
00 03 - represents the length in bytes of the command (real) that follows,
including the byte 00 (see below)
00 - fixed, reserved and not usable. However, it contributes to forming
the length in bytes of the command, for example in case of a device
renaming command (which will contain the new name assigned): the
length byte (and the checksum) will be recalculated also according
to the length of the new name
02 - the actual command (ON)
01 - command parameter; in this case we are giving the ON command (02)
and as a parameter the channel number to be switched on (01).
06 - checksum, and represents the sum (in HEX) of the parts:
(0x00 + 0x03 + 0x00 + 0x02 + 0x01) = 0x06
响应：
AA 55 - marks the message as a response
00 04 - response length
00 - reserved
82 01 - is the confirmation response to the ON command
01 - channel/port that was affected
88 - checksum: (0x00 + 0x04 + 0x00 + 0x82 + 0x01 + 0x01) = 0x88
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