ESP8266_ SmartConfig

1、WiFi Distribution network mode

The Internet of things Wi-Fi Distribution network mode , You know how many ？- Alicloud developer community (aliyun.com)

This article introduces and analyzes several WiFi Distribution network mode , I recommend it , At present, the mainstream WiFi The distribution network has equipment hotspots 、 Bluetooth distribution network 、 One key distribution network （SmartConfig）;

• Equipment hotspot distribution network ： Hot spots created by mobile phones and devices , Put those who can access the Internet WiFi Name and password are sent to the device ;
• Bluetooth distribution network ： The mobile phone is connected to the device via Bluetooth , Put those who can access the Internet WiFi Name and password are sent to the device ;
• One key distribution network ： Mobile phones are still connected to Internet WiFi, radio broadcast WiFi Name and password , The device is on sniffer Mode monitor , obtain WiFi Name and password ;

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2、SmartConfig Distribution network

• The device has reached the sniffer Pattern ( Also known as hybrid mode , That is, the data message is not filtered ), Listen to all the... In the environment 802.11 message ;
• The device needs to be in the supported channel （ Usually 1-13） Upper polling listening （ Because the device does not know the channel between the user's mobile phone and the target router ）;
• Catch a match Data message of distribution network rules Stop channel polling after , Attempt to receive all messages on this channel ;
• If the current channel fails to receive or times out, go back to step 2;
• Close when the data message is received sniffer Pattern , go back to station Pattern And start trying to connect to the router , The narrow distribution network process is completed .

  

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3、ESP8266 Of SmartConfig Interface

Set up SmartConfig Pattern , Turn on SmartConfig, There are callback functions according to different stages of the distribution network , Then close SmartConfig;

3.1、smartconfig_set_type 

Because we use wechat Airkiss function , So choose SC_TYPE_AIRKISS;

ESPTOUCH It is one developed by Lexin APP, For distribution network , Here there is no ;

  

3.2、smartconfig_start 

Just follow the instructions , First set up STA The pattern calls this API, The parameters of the callback function are different at different stages of the distribution network , So we can switch case Perform corresponding operations according to the status , And officially API There are also sample references under the document ;

  

3.3、smartconfig_stop  

  close SmartConfig Pattern , Free memory , In the access to IP Then call ;

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4、 Code

According to the last time MQTT The program of , What I want to add is ,Flash Medium SSID Connect with password AP Failure 10 After that , Get into SmartConfig Distribution network , And then in “ Anxinko Technology ” Distribution network on official account , And put the new SSID And password update to Flash, In this way, the power distribution network will not be needed next time ; Of course , Like just WiFi If you are disconnected, you can restart without the network （ It would be nice if it could be restored automatically , Dig a hole ）

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Realize the above functions It just needs to be modified wifi.c Code for , Count as wifi Functions are added SmartConfig Let's expand , Header file to include #include "smartconfig.h" , The original wifi_check_ip The contents to be added in are as follows , Settings not obtained IP 10 After that, enter the one key distribution network ;

//  Timing function ： Check IP Acquisition 
static void ICACHE_FLASH_ATTR wifi_check_ip(void *arg)
{
	static u8 fail_num = 0;

	//  Not obtained IP Address -------------------------------------------------------------
	else{
		fail_num++;
		if(fail_num >= 10){
			fail_num = 0;
			INFO("--------------START SmartConfig------------------\r\n");
			//wifi_set_opmode(STATION_MODE);		//  Set to STA Pattern 
			smartconfig_set_type(SC_TYPE_AIRKISS); 	// ESP8266 Distribution network mode 【AIRKISS】
			smartconfig_start(smartconfig_done);	//  Get into 【 Intelligent distribution network mode 】, And set the callback function 
			return;
		}
	}
}

then add to SmartConfig Callback function for , The focus is on how to update SSID And password to Flash, And call user_main.c in WiFi Callback function after connection , To enter SNTP、TCP、MQTT And so on , Don't forget to restart the timer , Don't forget to put the default SSID Information error correction ;

// SmartConfig When the state changes , Enter this callback function 
//  Parameters 1：sc_status status /  Parameters 2： No type pointer 【 In different states ,[void *pdata] The parameters passed in are different 】
void ICACHE_FLASH_ATTR smartconfig_done(sc_status status, void *pdata)
{
    switch(status)
    {
    	// CmartConfig wait for 
        case SC_STATUS_WAIT:
            os_printf("\r\nSC_STATUS_WAIT\r\n");
            break;

        //  Find out 【WIFI The signal 】（8266 Wait for the distribution network in this state ）
        case SC_STATUS_FIND_CHANNEL:
            os_printf("\r\nSC_STATUS_FIND_CHANNEL\r\n");
    		os_printf("\r\n---- Please Use WeChat to SmartConfig ------\r\n\r\n");
    		break;

        //  Getting 【SSID】【PSWD】（8266 Capturing and decrypting 【SSID+PSWD】）
        case SC_STATUS_GETTING_SSID_PSWD:
            os_printf("\r\nSC_STATUS_GETTING_SSID_PSWD\r\n");
            //  Distribution network mode 
			sc_type *type = pdata;
            if (*type == SC_TYPE_ESPTOUCH){
            	os_printf("\r\nSC_TYPE:SC_TYPE_ESPTOUCH\r\n");
            }else{
            	os_printf("\r\nSC_TYPE:SC_TYPE_AIRKISS\r\n");
            }
            break;

        //  Successful acquisition 【SSID】【PSWD】, preservation STA Parameters , And connect WIFI
        case SC_STATUS_LINK:
            os_printf("\r\nSC_STATUS_LINK\r\n");
            struct station_config *sta_conf = pdata;	            //  obtain 【STA Parameters 】 The pointer 
            //  take 【SSID】【PASS】 Save to 【 external Flash】 in 
    		os_strncpy(sysCfg.sta_ssid, sta_conf->ssid, 32);		// 【STA_SSID】WIFI name 
    		os_strncpy(sysCfg.sta_pwd, sta_conf->password, 64);		// 【STA_PASS】WIFI password 
    		CFG_Save();												//  Burn the updated system parameters to Flash in 
			// Connect WiFi
            wifi_station_set_config(sta_conf);			//  Set up STA Parameters 【Flash】
	        wifi_station_disconnect();					//  To break off STA Connect 
	        wifi_station_connect();						// ESP8266 Connect WIFI
	    	break;

        // ESP8266 As STA, Successfully connected to WIFI
        case SC_STATUS_LINK_OVER:
            os_printf("\r\nSC_STATUS_LINK_OVER\r\n");
            smartconfig_stop();			//  stop it SmartConfig, Free memory 
			if(wifiCb){					//  Determine if... Is set [wifiConnectCb] function 
				wifiStatus = wifi_station_get_connect_status();	//  Get access status 
				wifiCb(wifiStatus);		// wifiCb(wifiStatus)=wifiConnectCb(wifiStatus)
			}
			//  Turn on the timer again -------------------------------------------------------
			os_timer_setfn(&WiFiLinker, (os_timer_func_t *)wifi_check_ip, NULL);
			os_timer_arm(&WiFiLinker, 1000, 0);		// 1s timing 

	    break;
    }
}