diff --git a/usr/client/python/ssh/__init__.py b/usr/client/python/ssh/__init__.py
new file mode 100644
index 00000000..0c1d4809
--- /dev/null
+++ b/usr/client/python/ssh/__init__.py
@@ -0,0 +1,232 @@
+import json
+import urllib
+import socket
+
+class Context(object):
+    def Ctx(self):
+        msg.echo("context")
+    def Cmd(self, msg):
+        msg.echo("command %s", dir(self))
+
+    def config(self, msg):
+        for k, v in self.configs.iteritems():
+            msg.append("key", k)
+            msg.append("value", str(json.dumps(v)))
+        msg.table()
+        msg.log("fuck %s", msg.meta["result"])
+
+    def Cap(self):
+        msg.echo("cache")
+
+class Message(object):
+
+    code = 0
+    @classmethod
+    def _incr_count(cls):
+        cls.code += 1
+        return cls.code
+
+    def __init__(self, m=None, target=None, remote_code=-1, message=None, meta={}):
+        self.code = self._incr_count()
+        self.remote_code = remote_code
+        self.message = m.code if m else message
+        self.target = target
+        self.meta = meta
+
+    def detail(self, *argv):
+        detail = self.meta.get("detail", [])
+        if argv:
+            try:
+                i = int(argv[0])
+                if 0 <= i and i < len(detail):
+                    return detail[i]
+                else:
+                    return ""
+            except:
+                self.meta["detail"] = argv
+        return self.meta.get("detail") or []
+
+    def detaili(self, *argv):
+        v = self.detail(*argv)
+        try:
+            return int(v)
+        except:
+            return 0
+
+    def option(self, key=None, value=None):
+        if key:
+            msg = self
+            while msg:
+                if key in msg.meta["option"]:
+                    return msg.meta[key]
+                msg = msg.message
+            return []
+        return self.meta.get("option", [])
+
+    def append(self, key=None, value=None):
+        if value is not None:
+            self.meta[key] = self.meta.get(key, [])
+            self.meta[key].append(value)
+            if key not in self.meta.get("append", []):
+                self.meta["append"] = self.meta.get("append", [])
+                self.meta["append"].append(key)
+
+        if key is not None:
+            return self.meta.get(key, [""])[0]
+
+        return self.meta.get("append", [])
+
+    def result(self, s=None):
+        if s:
+            self.meta["result"] = self.meta.get("result", [])
+            self.meta["result"].append(s)
+        return self.meta.get("result", [])
+
+    def table(self):
+        nrow = len(self.meta[self.meta["append"][0]])
+        ncol = len(self.meta["append"])
+
+        for j, k in enumerate(self.meta["append"]):
+            self.echo(k)
+            self.echo(" " if j < ncol-1 else "\n")
+        for i in range(nrow):
+            for j, k in enumerate(self.meta["append"]):
+                self.echo(self.meta[k][i])
+                self.echo(" " if j < ncol-1 else "\n")
+
+    def echo(self, s, *argv):
+        if len(argv) == 0:
+            self.result(s if len(argv) == 0 else s % argv)
+
+    def Conf(self, key=None, value=None):
+        if value is not None:
+            self.target.configs[key] = value
+        if key is not None:
+            return self.target.configs.get(key, "")
+        return self.target.configs
+
+    def log(self, s, *argv):
+        print s % argv
+
+class SSH(Context):
+    def __init__(self, m, target=None, name="demo", host="127.0.0.1", port=9090):
+        self.target = target or self
+        self.m = m
+        self.host = host
+        self.port = port
+        self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.socket.connect((host, port))
+        msg = Message(m)
+        msg.detail("recv", "add", name, "worker")
+        self.sendDetail(msg, self.recvResult, self)
+        self.recvLoop()
+
+    sendMM = {}
+    def sendDetail(self, msg, fun=None, obj=None):
+        msg.recvFun = fun
+        msg.recvObj = obj
+        self.sendMM[msg.code] = msg
+        self.socket.send("code: %s\n" % msg.code)
+        data = ["detail: %s" % urllib.quote(d) for d in msg.detail()]
+        for k, option in enumerate(msg.option()):
+            for i, v in enumerate(option):
+                data.append("%s: %s" % (urllib.quote(k) ,urllib.quote(v)))
+        data.append("\n")
+        self.socket.send("\n".join(data))
+        msg.log("send: %s %s", msg.code, data)
+
+    def recvResult(self, msg):
+        msg.log("echo: %s", msg.result())
+
+    def recvLoop(self):
+        m = self.m
+        self.file = self.socket.makefile()
+
+        meta = {}
+        while True:
+            l = self.file.readline()
+            if l == "\n":
+                m.log("recv: %s %s", meta.get("remote_code"), meta)
+                if "detail" in meta:
+                    msg = Message(m, self.target, remote_code=meta.get("remote_code"), meta=meta)
+                    self.recvDetail(msg)
+                else:
+                    msg = self.sendMM[int(meta.get("remote_code"))]
+                    msg.meta.update(meta)
+                    msg.recvFun and msg.recvFun(msg)
+                    msg.recvObj and msg.recvObj.recvResult(msg)
+                meta = {}
+                continue
+
+            v = l.rstrip("\n").split(": ")
+            if v[0] == "code":
+                meta["remote_code"] = v[1]
+            elif v[0] == "detail":
+                meta["detail"] = meta.get("detail", [])
+                meta["detail"].append(v[1])
+            elif v[0] == "result":
+                meta["result"] = meta.get("result", [])
+                meta["result"].append(v[1])
+            else:
+                if v[0] == "remote_code":
+                    continue
+                if v[0] not in meta:
+                    if "detail" in meta:
+                        meta["option"] = meta.get("option", [])
+                        meta["option"].append(v[0])
+                    else:
+                        meta["append"] = meta.get("append", [])
+                        meta["append"].append(v[0])
+                meta[v[0]] = meta.get(v[0], [])
+                meta[v[0]].append(v[1])
+
+    def pwd(self, msg):
+        msg.echo("shaoying")
+
+    def recvDetail(self, msg):
+        if hasattr(self.target, msg.detail(1)):
+            getattr(self.target, msg.detail(1))(msg)
+        self.sendResult(msg)
+
+    def sendResult(self, msg):
+        self.socket.send("code: %s\n" % msg.remote_code)
+        data = ["result: %s" % urllib.quote(d) for d in msg.result()]
+        for i, k in enumerate(msg.append()):
+            for i, v in enumerate(msg.meta[k]):
+                data.append("%s: %s" % (urllib.quote(k) ,urllib.quote(v)))
+        data.append("\n")
+        self.socket.send("\n".join(data))
+        msg.log("send: %s %s", msg.remote_code, data)
+
+try:
+    import RPi.GPIO as GPIO
+except:
+    GPIO = Context()
+    pass
+
+class RPI(Context):
+    def __init__(self):
+        self.configs = {
+                "setmode": False,
+                }
+
+    def gpio(self, msg, *argv):
+        if msg.detail(2) == "init":
+            GPIO.setmode(GPIO.BCM)
+        elif msg.detail(2) == "out":
+            if not msg.Conf("setmode"):
+                msg.log("default setmode")
+                msg.Conf("setmode", True)
+                GPIO.setmode(GPIO.BCM)
+            if msg.Conf(msg.detail(3)) != GPIO.OUT:
+                msg.log("default output")
+                msg.Conf(msg.detail(3), GPIO.OUT)
+                GPIO.setup(msg.detaili(3), GPIO.OUT)
+            GPIO.output(msg.detaili(3), msg.detaili(4))
+        elif msg.detail(2) == "exit":
+            GPIO.cleanup()
+
+import sys
+SSH(Message(), RPI(),
+        sys.argv[1] if len(sys.argv) > 1 else "demo",
+        sys.argv[2] if len(sys.argv) > 2 else "127.0.0.1")
diff --git a/usr/wiki/自然/编程/后端技术栈/raspi.md b/usr/wiki/自然/编程/后端技术栈/raspi.md
new file mode 100644
index 00000000..e47d0c67
--- /dev/null
+++ b/usr/wiki/自然/编程/后端技术栈/raspi.md
@@ -0,0 +1,117 @@
+## 树莓派
+
+- 官网：<https://www.raspberrypi.org/>
+- 文档：<https://www.raspberrypi.org/documentation/>
+- 开源：<https://github.com/raspberrypi>
+
+## 基本配置
+
+- 官网：<http://www.raspbian.org/>
+- 文档：<http://www.raspbian.org/RaspbianDocumentation>
+
+lsb_release
+raspi-config
+/boot/config.txt
+
+/etc/network/interfaces
+/etc/wpa_supplicant/wpa_supplicant.conf
+
+/etc/hostname
+/etc/hosts
+
+## 基本命令
+
+- 官网：<https://www.debian.org/>
+- 文档：<https://www.debian.org/doc/>
+
+ls
+cp
+mv
+rm
+cd
+pwd
+mkdir
+rmdir
+
+cat
+echo
+more
+nano
+vi
+
+sudo
+chmod
+chown
+
+find
+grep
+
+ps
+fg
+bg
+top
+kill
+killall
+history
+alias
+man
+
+df
+date
+lsusb
+lsmod
+
+wget
+curl
+tar
+git
+
+apt-get update
+apt-get install
+apt-get remove
+apt-get clean
+
+apt-get install python-pip
+pip install
+
+crontab
+/etc/rc.local
+/etc/init.d/
+update-rc.d 
+
+## 基础编程
+
+- 官网：<https://www.python.org/>
+- 文档：<https://docs.python.org/2/>
+
+python
+hi.py
+
+input()
+print()
+open()
+
+int()
+str()
+len()
+
+if
+elif
+else
+for in range/enumerate
+while
+break
+continue
+
+def
+
+class
+new
+
+try
+except
+else
+finally
+
+from import as
+