使用Mind+ 掌控版连接EasyIot DF创客社区

秦皇岛岛主 发表于 2019-1-10 21:41:39

使用Mind+ 掌控版连接EasyIot

开放的IOT平台目前非常多，但根据哥的经验，很多对初学者不是很友好，各种信息类型，各种触发器，想控制个远程开关的，需要学习大量背景知识。幸亏有EasyIOT，没有看来这个平台确实是市面上最简单的，所有的数据类型都是字符串。publish和subscribe 一到两个主题，即可完成简单的物联网监控和远程控制功能。

准备工作：
1. Mind+ 1.5.0及以上版本（传送到这里下载https://mindplus.cc）
2. 掌控板我手上是1.0版本
3. 注册一个easyiot账号（传送到这里注册 https://iot.dfrobot.com.cn）

开始干活：
第一步：安装Mind+，打开Mind+
就不啰嗦拉，一路next即可

第二步：将掌控版插到电脑上
用microUSB线连接，如果电脑上不能显示对应的串口号。安装串口驱动（Mind+内部集成了各类串口驱动）
我的电脑已经安装过了，所以找到了COM7-CP210x，如果你的电脑找不到，点击一键安装串口驱动（需要管理员权限）。

第三步：切换到上传执行模式

第四步：切换到micropython语言

第五步：选择对应的串口，我的电脑就是COM7
这时，如果你的掌控板没有micropython固件，MindPlus会自动给你烧录固件（注意有些掌控板子出厂缺少2个电阻，烧录过程中需要按下A按键再松开）。之后，Mind+就自动连接到了掌控版的micropython固件。
第六步：新建umqtt文件夹

第七步：在umqtt文件夹下新建文件simple.py

第八步：双击新建的simple.py文件，将下面的内容复制到里边，然后点击保存

import usocket as socket
import ustruct as struct
#from ubinascii import hexlify

class MQTTException(Exception):
pass

class MQTTClient:

def __init__(self, client_id, server, port=0, user=None, password=None, keepalive=0,ssl=False, ssl_params={}):
if port == 0:
   port = 8883 if ssl else 1883
self.client_id = client_id
self.sock = None
self.addr = socket.getaddrinfo(server, port)[-1]
self.ssl = ssl
self.ssl_params = ssl_params
self.pid = 0
self.cb = None
self.user = user
self.pswd = password
self.keepalive = keepalive
self.lw_topic = None
self.lw_msg = None
self.lw_qos = 0
self.lw_retain = False

def _send_str(self, s):
self.sock.write(struct.pack("!H", len(s)))
self.sock.write(s)

def _recv_len(self):
n = 0
sh = 0
while 1:
   b = self.sock.read(1)
   n |= (b & 0x7f) << sh
   if not b & 0x80:
   return n
   sh += 7

def set_callback(self, f):
self.cb = f

def set_last_will(self, topic, msg, retain=False, qos=0):
assert 0 <= qos <= 2
assert topic
self.lw_topic = topic
self.lw_msg = msg
self.lw_qos = qos
self.lw_retain = retain

def connect(self, clean_session=True):
self.sock = socket.socket()
self.sock.connect(self.addr)
if self.ssl:
   import ussl
   self.sock = ussl.wrap_socket(self.sock, **self.ssl_params)
msg = bytearray(b"\x10\0\0\x04MQTT\x04\x02\0\0")
msg = 10 + 2 + len(self.client_id)
msg = clean_session << 1
if self.user is not None:
   msg += 2 + len(self.user) + 2 + len(self.pswd)
   msg |= 0xC0
if self.keepalive:
   assert self.keepalive < 65536
   msg |= self.keepalive >> 8
   msg |= self.keepalive & 0x00FF
if self.lw_topic:
   msg += 2 + len(self.lw_topic) + 2 + len(self.lw_msg)
   msg |= 0x4 | (self.lw_qos & 0x1) << 3 | (self.lw_qos & 0x2) << 3
   msg |= self.lw_retain << 5
self.sock.write(msg)
#print(hex(len(msg)), hexlify(msg, ":"))
self._send_str(self.client_id)
if self.lw_topic:
   self._send_str(self.lw_topic)
   self._send_str(self.lw_msg)
if self.user is not None:
   self._send_str(self.user)
   self._send_str(self.pswd)
resp = self.sock.read(4)
assert resp == 0x20 and resp == 0x02
if resp != 0:
   raise MQTTException(resp)
return resp & 1

def disconnect(self):
self.sock.write(b"\xe0\0")
self.sock.close()

def ping(self):
self.sock.write(b"\xc0\0")

def publish(self, topic, msg, retain=False, qos=0):
pkt = bytearray(b"\x30\0\0\0")
pkt |= qos << 1 | retain
sz = 2 + len(topic) + len(msg)
if qos > 0:
   sz += 2
assert sz < 2097152
i = 1
while sz > 0x7f:
   pkt = (sz & 0x7f) | 0x80
   sz >>= 7
   i += 1
pkt = sz
#print(hex(len(pkt)), hexlify(pkt, ":"))
self.sock.write(pkt, i + 1)
self._send_str(topic)
if qos > 0:
   self.pid += 1
   pid = self.pid
   struct.pack_into("!H", pkt, 0, pid)
   self.sock.write(pkt, 2)
self.sock.write(msg)
if qos == 1:
   while 1:
   op = self.wait_msg()
   if op == 0x40:
      sz = self.sock.read(1)
      assert sz == b"\x02"
      rcv_pid = self.sock.read(2)
      rcv_pid = rcv_pid << 8 | rcv_pid
      if pid == rcv_pid:
         return
elif qos == 2:
   assert 0

def subscribe(self, topic, qos=0):
assert self.cb is not None, "Subscribe callback is not set"
pkt = bytearray(b"\x82\0\0\0")
self.pid += 1
struct.pack_into("!BH", pkt, 1, 2 + 2 + len(topic) + 1, self.pid)
#print(hex(len(pkt)), hexlify(pkt, ":"))
self.sock.write(pkt)
self._send_str(topic)
self.sock.write(qos.to_bytes(1, "little"))
while 1:
   op = self.wait_msg()
   if op == 0x90:
   resp = self.sock.read(4)
   #print(resp)
   assert resp == pkt and resp == pkt
   if resp == 0x80:
      raise MQTTException(resp)
   return

# Wait for a single incoming MQTT message and process it.
# Subscribed messages are delivered to a callback previously
# set by .set_callback() method. Other (internal) MQTT
# messages processed internally.
def wait_msg(self):
res = self.sock.read(1)
self.sock.setblocking(True)
if res is None:
   return None
if res == b"":
   raise OSError(-1)
if res == b"\xd0":# PINGRESP
   sz = self.sock.read(1)
   assert sz == 0
   return None
op = res
if op & 0xf0 != 0x30:
   return op
sz = self._recv_len()
topic_len = self.sock.read(2)
topic_len = (topic_len << 8) | topic_len
topic = self.sock.read(topic_len)
sz -= topic_len + 2
if op & 6:
   pid = self.sock.read(2)
   pid = pid << 8 | pid
   sz -= 2
msg = self.sock.read(sz)
self.cb(topic, msg)
if op & 6 == 2:
   pkt = bytearray(b"\x40\x02\0\0")
   struct.pack_into("!H", pkt, 2, pid)
   self.sock.write(pkt)
elif op & 6 == 4:
   assert 0

# Checks whether a pending message from server is available.
# If not, returns immediately with None. Otherwise, does
# the same processing as wait_msg.
def check_msg(self):
self.sock.setblocking(False)
return self.wait_msg()

第九步：在根目录下新建mqtt.py文件，将下面的文件内容拷贝到里边
from mpython import *
from umqtt.simple import MQTTClient
from machine import Pin
import network
import time

SSID="替换成你的wifi名称"
PASSWORD="替换成你的wifi密码"

SERVER = "182.254.130.180"
CLIENT_ID = "nouse"
TOPIC = b"替换成你的TOPIC"
username='替换成你的easyiot用户名'
password='替换成你的easyiot用户密码'

state = 0
c=None
def sub_cb(topic, msg):
global state
print((topic, msg))
oled.DispChar('             ',0,32)
oled.DispChar('接收到'+str(msg,'utf-8'), 0, 32)
oled.show()

def connectWifi(ssid,passwd):
global wlan
wlan=network.WLAN(network.STA_IF)       #create a wlan object
wlan.active(True)                      #Activate the network interface
wlan.disconnect()                      #Disconnect the last connected WiFi
wlan.connect(ssid,passwd)             #connect wifi
while(wlan.ifconfig()=='0.0.0.0'):
time.sleep(1)

def button_a_callback(_):
c.publish(TOPIC,"buttonA")

def button_b_callback(_):
c.publish(TOPIC,"buttonB")

#Catch exceptions,stop program if interrupted accidentally in the 'try'
try:
connectWifi(SSID,PASSWORD)
server=SERVER
c = MQTTClient(CLIENT_ID, server,0,username,password) #create a mqtt client
c.set_callback(sub_cb)                #set callback
c.connect()                            #connect mqtt
c.subscribe(TOPIC)                      #client subscribes to a topic
print("Connected to %s, subscribed to %s topic" % (server, TOPIC))

button_a.irq(trigger=Pin.IRQ_FALLING, handler=button_a_callback)
button_b.irq(trigger=Pin.IRQ_FALLING, handler=button_b_callback)
oled.fill(0)
oled.DispChar('连接'+server,0,0)
oled.show()
while True:
c.wait_msg()                         #wait message
finally:
if(c is not None):
c.disconnect()
wlan.disconnect()
wlan.active(False)

第十步：这是一个补充步骤，给那些还没用过的easyiot的人准备的，如果找到用户名密码和topic

点击发送消息

第十一步：右键运行mqtt.py，easyiot就玩起来拉
按下按键A，easyiot接收到了buttonA，按下按键B，easyiot接收到了buttonB。由于我们同时订阅了这个Topic，接收到的信息会下发给掌控板，输入消息，点击发送，可以从网页给掌控板发送消息

rzyzzxw 发表于 2019-1-11 08:13:19

本帖最后由 rzyzzxw 于 2019-1-11 09:43 编辑

好棒的教程，这样就可以玩DF 的IOT了。{:5_148:}学习就是要高手带。

rzegkly 发表于 2019-1-11 08:22:32

掌控在IOT方面有了新的玩法{:5_180:}

春暖花开1 发表于 2019-3-12 22:20:22

初学者求助大神：为什么出现以下错误？Traceback (most recent call last):
File "<string>", line 37, in button_a_callback
File "umqtt/simple.py", line 109, in publish
TypeError: object with buffer protocol required
Traceback (most recent call last):
File "<string>", line 40, in button_b_callback
File "umqtt/simple.py", line 109, in publish
TypeError: object with buffer protocol required

DFS1Slxg5_4 发表于 2019-3-28 16:47:46

大神求助我可以接受到网页发出的消息，但是掌控板的按键按下却没有消息的回馈这是为什么？

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使用Mind+ 掌控版 连接EasyIot

使用Mind+ 掌控版连接EasyIot