實現的功能

該模組上電後主動以mobusRTU協議，通過本模組的串列埠將氣體檢測儀的4路感測器資料讀取

模組上電後連線指定WiFi，通過MQTT協議將讀取到的資料以JSON格式推送到指定伺服器。

具體細分為如下幾個小過程：

1. 模組上電後主動連線到指定WiFi
2. 模組連線到指MQTT伺服器
3. 模組通過modbusRTU協議主動讀取裝置資料
4. 模組主動將讀取到的資料推送到mqtt伺服器

配置環境

1. PC系統（Windows 10 專業版 21H1）
2. WIFI AP（使用手機共享2.4G熱點）
3. USB轉485通訊模組

配置軟體

1. Advanced_IP_Scanner
2. IOTServiceSetupX64_3.0.03
3. modbusPLC Simulator
4. mosquitto-2.0.11

Advanced_IP_Scanner

區域網裝置掃描軟體，在該處用於獲取區域網內HF2211S從AP中獲取到的IP地址。

IOTServiceSetupX64_3.0.03

用於發現並配置HF2211S

modbusPLC Simulator

用於模擬氣體探測儀，可以檢視從模組發來的報文，便於除錯modbusRTU主站。

mosquitto-2.0.11

MQTT服務端軟體，HF2211S將485口讀取到的資料不做解析，轉發到MQTT伺服器。

配置截圖

安裝前文中提到的配置軟體

電腦連線模組自帶的WiFi

開啟配置軟體，會自動顯示搜尋到的區域網內的模組，點選裝置編輯

主要設定如下引數

1. WIFI模式 STA

​ STA無線名稱、密碼

2. 連線協議相關資訊

​ 協議：MQTT、訂閱主題、釋出主題、伺服器端地址、埠號

3. 串列埠資訊

​ 波特率、資料位、停止位、校驗位

基本引數設定設定完成後，點選高階設定，再點選編輯指令碼，匯入串列埠指令碼，實現模組主動讀取裝置資料及資料上送功能。

將如下指令碼儲存為txt檔案，並匯入指令碼

key=""

cmd01=[0x05,0x03,0x01,0x33,0x00,0x37,0xF4,0x6B]
cmd02=[0x05,0x03,0x02,0x33,0x00,0x37,0xF4,0x2F]
cmd03=[0x05,0x03,0x03,0x33,0x00,0x37,0xF5,0xD3]
cmd04=[0x05,0x03,0x04,0x33,0x00,0x37,0xF4,0xA7]

num=0

TIMER HeartBeat 500
   num=num+1
   IF(num==1)
   SEND(UART,uart0,cmd01)
   key="CH1"
   END
   IF(num==2)
   SEND(UART,uart0,cmd02)
   key="CH2"
   END
   IF(num==3)
   SEND(UART,uart0,cmd03)
   key="CH3"
   END
   IF(num==4)
   SEND(UART,uart0,cmd04)
   key="CH4"
   num=0
   END
END

RECV UART uart0
 DATA=INPUT
 DATA_S=DATA.hexString()
 DATA_B="{\"key\":\""+key+"\",\"value\":\""+DATA_S+"\"}"
 SEND(SOCK,netp,DATA_B)
END
 

上述程式碼部分說明

cmd01=[0x05,0x03,0x01,0x33,0x00,0x37,0xF4,0x6B]  //需要通過傳送的命令1
ER HeartBeat 500  //500毫秒執行一次命令

裝置狀態檢視

串列埠報文捕獲

05 03 01 33 00 37 F46B
05036E000003E800000000000000000000000000000000000000000000000000004248000043480000000000000000000000000000AC5C00170000000000000000000000000000000000000000B08800170000000038DD0028FFFF4398000000000000000000000000000000000006000120B7

05 03 02 33 00 37 F42F
05036E0000001E00000000000000000000000000000000000000000000000000004190000041B80000000000000000000000000000E5A20008333341A7000000000000000000000000000200009C75000000000000E84B0008333341A7000000000000000000000000000000000006000184D1

05 03 03 33 00 37 F5D3
05036E00000064000000000000000000000000000000000000000000000000FFFF419F0000424800000000000000000000000000008D8300170000000000000000000000000000000000020000899E001700000000F18300350000424800000000000000000000000000000000000600016049

05 03 04 33 00 37 F4A7
05036E000003E800000000000000000000000000000000000000000000000000004248000043480000000000000000000000000000AC3600170000000000000000000000000000000000000000B08800170000000038DD0028FFFF4398000000000000000000000000000000000006000100C1

MQTT報文捕獲

{"key":"CH1","value":"05036E000003E800000000000000000000000000000000000000000000000000004248000043480000000000000000000000000000AC5C00170000000000000000000000000000000000000000B08800170000000038DD0028FFFF4398000000000000000000000000000000000006000120B7"}

{"key":"CH2","value":"05036E0000001E00000000000000000000000000000000000000000000000000004190000041B80000000000000000000000000000E5A20008333341A7000000000000000000000000000200009C75000000000000E84B0008333341A7000000000000000000000000000000000006000184D1"}

{"key":"CH3","value":"05036E00000064000000000000000000000000000000000000000000000000FFFF419F0000424800000000000000000000000000008D8300170000000000000000000000000000000000020000899E001700000000F18300350000424800000000000000000000000000000000000600016049"}

{"key":"CH4","value":"05036E000003E800000000000000000000000000000000000000000000000000004248000043480000000000000000000000000000AC3600170000000000000000000000000000000000000000B08800170000000038DD0028FFFF4398000000000000000000000000000000000006000100C1"}

附：氣體檢測儀地址表

{"key":"CH2","value":"05036E 0000001E00000000000000000000000000000000000000000000000000004190000041B80000000000000000000000000000E5A20008333341A7000000000000000000000000000200009C75000000000000E84B0008333341A70000000000000000000000000000000000060001 84D1"}

MQTT報文中，value值中，頭部 3個位元組 05036E 尾部2個位元組CRC校驗 84D1去除，中間部分為對應通道的資料。

MQTT報文中，第二通道氧氣實時濃度對應的報文為 3333 41A7，對應浮點數: 20.899999618530273