Ser2net (zt)

ser2net（Serial to Network Proxy）给用户提供了一种网络与串口相互连接的软件。因为是基于linux的，所以它可以在Openwrt上运行，至于它能为你做什么，就看你了。
这里说一下怎么去配置和安装它。
对于已经刷好openwrt的路由器，你先配置网络信息，使其能够连上外网，之后在windows下可以用putty这个软件通过SSH来接入路由，对于linux用户，可以直接用终端中带的SSH功能来登陆，之后，运行opkg update，来更新下其软件包。之后用
 

来安装这个软件，之后进入/etc这个目录，使用

来编辑它的内容，在文件中的前部，主要是讲解的怎么去配置它。有兴趣的可以去仔细的看看。之后到后面，没有#号的地方，我们可以把不用的语句删掉，当然也可以不管。之后执行
 

此时，我们就已经可以通过网络来给串口发送数据了，但是，因为端口引用的原因，还没法实现串口数据到网络。此时，我们就要改其他文件了，只是进入init.d这个文件夹，找到inittab这个文件，我们将该文件中的与你用到的端口有关的语句删掉之后重启就行了。（对于有些文件，在修改后要执行：wq！，不然没法正常的退出，这要注意！！！）
在重启之后，在打开ser2net就能实现ser2net的双向通信了。
此时唯一的问题就是程序的开机自启问题了，这个需要自己去写启动脚本。具体的操作，将在之后为你讲解。。。。。

另外补充一点东西：
#
# This is an example configuration file for ser2net. It has the following
# format:
# <TCP port>:<state>:<timeout>:<device>:<options>
# TCP port
# Name or number of the TCP/IP port to accept con-
# nections from for this device. A port number may
# be of the form [host,]port, such as 127.0.0.1,2000
# or localhost,2000. If this is specified, it will
# only bind to the IP address specified. Otherwise
# it will bind to all the ports on the machine.
#
# state Either raw or rawlp or telnet or off. off disables
# the port from accepting connections. It can be
# turned on later from the control port. raw enables
# the port and transfers all data as-is between the
# port and the long. rawlp enables the port and
# transfers all input data to device, device is open
# without any termios setting. It allow to use
# /dev/lpX devices and printers connected to them.
# telnet enables the port and runs the telnet proto-
# col on the port to set up telnet parameters. This
# is most useful for using telnet.
#
# timeout
# The time (in seconds) before the port will be dis-
# connected if there is no activity on it. A zero
# value disables this function.
#
# device The name of the device to connect to. This
# must be in the form of /dev/<device>.
#
# options
# Sets operational parameters for the serial port.
# Options 300, 1200, 2400, 4800, 9600, 19200, 38400,
# 57600, 115200 set the various baud rates. EVEN,
# ODD, NONE set the parity. 1STOPBIT, 2STOPBITS set
# the number of stop bits. 7DATABITS, 8DATABITS set
# the number of data bits. [-]XONXOFF turns on (-
# off) XON/XOFF support. [-]RTSCTS turns on (- off)
# hardware flow control, [-]LOCAL turns off (- on)
# monitoring of the modem lines, and
# [-]HANGUP_WHEN_DONE turns on (- off) lowering the
# modem control lines when the connection is done.
# NOBREAK disables automatic setting of the break
# setting of the serial port.
# The "remctl" option allow remote control (ala RFC
# 2217) of serial-port configuration. A banner name
# may also be specified, that banner will be printed
# for the line. If no banner is given, then no
# banner is printed.
# The tw, tr, and tb options take a tracefile name (
# specified in TRACEFILE that will take all traced data.
# tw is data written to the device, tr is data read from
# the device, and tb is both.
#
# or...

# BANNER:<banner name>:banner
# This will create a banner, if the banner name is given in the
# options of a line, that banner will be printed. This takes the
# standard "C" \x characters (\r is carraige return, \n is newline,
# etc.). It also accepts \d, which prints the device name, \p,
# which prints the TCP port number, and \s which prints the serial
# parameters (eg 9600N81). Banners can span lines if the last
# character on a line is '\'. Note that you *must* use \r\n to
# start a new line.
#
# TRACEFILE:<name>:filename
# This specifies a filename to trace output into, as tw:/tmp/trace1.
# This takes a large number of escape sequences, see the man page
# for details on these options.
#
# Note that the same device can be listed multiple times under different
# ports, this allows the same serial port to have both telnet and raw
# protocols.
这些是ser2net的原文，捡其中的重点和看懂的部分翻译一下：
配置格式：
<TCP端口号>:<状态>:<超时>:<设备>:<选项>
TCP端口号：【host，】port，也就是说可以这样写localhost，2020 意思就是使用本机的2020端口作为映射端口
状态：可以填写raw，rawlp，telnet或者off
off禁止端口，但是可以从控制口唤醒
raw：在端口和串口设备之间双向通信
rawlp：端口想串口设备单向通信
telnet：
超时：指定一个数值用于超时，写0禁用超时
设备：必须这样写/dev/《设备名称》
选项：设置串口的参数如：波特率（300，1200，2400，4800，9600，19200，38400，57600，115200）
校验（EVEN，ODD，NONE）
停止位（1STOPBIT,2STOPBITS)
数据位（7DATABITS，8DATABITS）
开启（关闭）XON\XOFF ：XONXOFF（-XONXOFF）
开启（关闭）硬件控制流：RTSCTS（-RTSCTS)
其他的内容没有看明白，等待大家的补充，谢谢