1. Introduction
1. Project introduction
The previously published article used the 4G LTE Cat.1 module of Hezhou, and the programming language is lua. Overall, the code is relatively simple, and realizes the device communication and control of the Huawei Cloud IoT platform, that is, a variable is used as the simulation attribute Report regularly, and use an LED light as a controlled device to control cloud commands. The content of this issue is to use the Alibaba Cloud IoT platform to complete the same above functions.
Prepare:
Air780e development board
usb-typec data cable
4G SIM mobile phone card (can access the Internet)
2. Air780E module
Air780E is the LTE Cat.1bis communication module launched by Hezhou Communication. It adopts the mobile core EC618 platform, supports 4G full Netcom, supports dual card single standby, supports SPI LCD, supports USB 2.0, only CDC function, supports I2S digital voice interface, and supports cameras And other configurations, support AT command development, CSDK development and multiple developments of luatos' lua scripting language. The development board is currently 39.9 on Taobao's official website, and the price/performance ratio is still ok
3、luats
Lua can be said to be a scripting language with the smallest resource occupation, the highest operating efficiency, and the most concise syntax among the current embedded solutions. For programming beginners, it is suitable as your introductory programming language because the syntax is simple. For veterans who know the c language, it fits perfectly with c, and LuatOS itself is open source, you can easily use c to add a set of c library interfaces to it, and enjoy its high efficiency. In this tutorial, we use the lua language to run luatos to realize device communication and control on the Alibaba Cloud IoT platform.
4. Alibaba Cloud IoT Platform
The relevant configuration of the Alibaba Cloud IoT platform will not be repeated here. You can refer to the official documents or videos for the process of creating products, devices, attributes, etc. The main data that needs to be prepared in advance is the MQTT of the Alibaba Cloud IoT platform devices. Connection parameters, MQTT publish and subscribe topics, device properties, etc., refer to the following:
--根据自己阿里云物联网平台的配置修改以下参数，下列参数仅作参考
local client_id = "a1ZR8uuCkfP.air780e_test|securemode=2,signmethod=hmacsha256,timestamp=1681048410186|"
local user_name = "air780e_test&a1ZR8u41341"
local password = "9b075c78b1a600065d28af9000www.funiot.xyz000www.funiot.xyz000"
local mqtt_host = "a1ZR8uuCkfP.iot-as-mqtt.cn-shanghai.aliyuncs.com"
local mqtt_port = 1883
Subscribe to a topic and set device properties:
local devdata_topic="/sys/a1ZR8uuCkfP/air780e_test/thing/event/property/post" --订阅属性上报主题
local cmdrec_topic="/sys/a1ZR8uuCkfP/air780e_test/thing/service/property/set" --订阅属性设置主题
local dev_control="thing.service.property.set" --订阅属性控制下发主题
local command_name="LED_Control" --控制命令
2. Complete development process
1. Download software package and compile and burn tools
1) LuatOS software package: Air780e uses LuatOS-SoC@EC618
Download link: LuatOS-SoC@EC618 V1103
2) Debugging and programming tools: Luatools
Download link: luatools debugging and burning tool
2. Write luatos script
-- LuaTools需要PROJECT和VERSION这两个信息
PROJECT = "led"
VERSION = "1.0.0"
-- 引入必要的库文件(lua编写), 内部库不需要require
sys = require("sys")
log.info("main", "led")
print(_VERSION)
if wdt then
--添加硬狗防止程序卡死，在支持的设备上启用这个功能
wdt.init(9000)--初始化watchdog设置为9s
sys.timerLoopStart(wdt.feed, 3000)--3s喂一次狗
end
--用户代码开始---------------------------------------------------
--根据自己阿里云物联网平台的配置修改以下参数，下列参数仅作参考
local mqtt_host = "a1ZR8uuCkfP.iot-as-mqtt.cn-shanghai.aliyuncs.com"
local mqtt_port = 1883
local mqtt_isssl = false
local client_id = "a1ZR8uuCkfP.air780e_test|securemode=2,signmethod=hmacsha256,timestamp=1681048410186|"
local user_name = "air780e_test&a1ZR81132134"
local password = "9b075c78b1a600065d28afa0d3b42www.funiot.xy&&www.funiot.xyz"
local mqtt_aliyun = nil
local devdata_topic="/sys/a1ZR8uuCkfP/air780e_test/thing/event/property/post" --订阅属性上报主题
local cmdrec_topic="/sys/a1ZR8uuCkfP/air780e_test/thing/service/property/set" --订阅属性设置主题
local dev_control="thing.service.property.set" --订阅属性控制下发主题
local command_name="LED_Control" --控制命令
local LED_PIN=27 --LED引脚编号
gpio.setup(LED_PIN,0, gpio.PULLUP) --设置LED上拉输出
sys.taskInit(function()
print("connected to aliyun example\r\n")
while 1 do
--网络相关
mobile.simid(2)
LED = gpio.setup(27, 0, gpio.PULLUP)
device_id = mobile.imei()
sys.waitUntil("IP_READY", 30000)
--mqtt客户端创建
mqtt_aliyun = mqtt.create(nil,mqtt_host, mqtt_port, mqtt_isssl, ca_file)
mqtt_aliyun:auth(client_id,user_name,password)
mqtt_aliyun:keepalive(60) -- 默认值240s
mqtt_aliyun:autoreconn(true, 3000) -- 自动重连机制
--注册mqtt回调
mqtt_aliyun:on(function(mqtt_client, event, data, payload)
-- 用户自定义代码
log.info("mqtt", "event", event, mqtt_client, data, payload)
if event == "conack" then --连接响应成功
sys.publish("mqtt_conack")--订阅主题
mqtt_client:subscribe(pub_devdata_topic)
mqtt_client:subscribe(pub_cmdrec_topic)
elseif event == "recv" then
log.info("mqtt", "downlink", "topic", data, "payload", payload)
print("payload:",payload)
--解析json
--例如：
--{
"method":"thing.service.property.set","id":"273481693","params":{
"LED_Control":1},"version":"1.0.0"}
local mycmd=json.decode(payload)
if mycmd then -- 若解码失败, 会返回nil
print("method :",mycmd["method"])
print("params is",mycmd["params"])
print("params->LED_Control is",mycmd["params"]["LED_Control"])
if mycmd["method"]==dev_control then
if mycmd["params"]["LED_Control"]==1 then
print("led turn on")
gpio.set(LED_PIN, gpio.HIGH)
elseif mycmd["params"]["LED_Control"]==0 then
print("led turn off")
gpio.set(LED_PIN, gpio.LOW)
end
end
end
elseif event == "sent" then
log.info("mqtt", "sent", "pkgid", data)
-- elseif event == "disconnect" then
-- 非自动重连时,按需重启mqtt_aliyun
-- mqtt_client:connect()
end
end)
--连接mqtt
mqtt_aliyun:connect()
sys.waitUntil("mqtt_conack")
while true do
-- mqtt_aliyun自动处理重连
local ret, topic, data, qos = sys.waitUntil("mqtt_pub", 30000)
if ret then
if topic == "close" then break end
mqtt_aliyun:publish(topic, data, qos)
end
end
mqtt_aliyun:close()
mqtt_aliyun = nil
end
end)
--定时上报属性
sys.taskInit(function()
local topic = devdata_topic --上报的topic
local temp=0 --温度属性值
local data = "{\"method\":\"thing.service.property.set\",\"params\":{\"IndoorTemperature\":"..tostring(temp).."}}"
local qos = 1
local temp=0
while true do
sys.wait(5000)
if mqtt_aliyun and mqtt_aliyun:ready() then
-- mqtt_aliyun:subscribe(topic)
local pkgid = mqtt_aliyun:publish(topic, data, qos)
temp=temp+1
data = "{\"method\":\"thing.service.property.set\",\"params\":{\"IndoorTemperature\":"..tostring(temp).."}}"
print(data)
-- 也可以通过sys.publish发布到指定task去
-- sys.publish("mqtt_pub", topic, data, qos)
end
end
end)
-- 用户代码已结束---------------------------------------------
-- 结尾总是这一句
sys.run()
-- sys.run()之后后面不要加任何语句!!!!!
3. Compile and burn
Open Luatools, click the project management button, select the downloaded firmware (the file with the suffix soc) and the prepared main.lua file, check the USB BOOT download, click the download bottom layer and script button to download, the specific operation process is as follows As shown in the figure:
4. Running results
[Note] The command is issued by setting the device properties, as shown in the figure below
When the command is received, the LED light of the development board will complete the switch according to the corresponding command sent.
6. Other related reference articles
[esp8266 connects to Huawei Cloud IoT platform to complete attribute reporting and command processing]
[Hezhou Air780e+luatos connects to Huawei Cloud IoT platform to complete device communication and control]