ESP8266 AP_ TCP_ Server

Catalog

Preface

stay user_init After initialization , take ESP8266_AP Pattern , after 1s Clock repetition timing

In the timing callback function , Inquire about AP In mode ESP8266 Of IP Address ,ESP8266 Successful acquisition IP After the address , off timer , Initialize the network connection (TCP signal communication )

In initializing the network connection (TCP signal communication )

Callback function that successfully receives network data

  Callback function for successfully sending network data

TCP Callback function for successful disconnection

TCP Callback function when the connection is abnormally disconnected

---

Preface

8266 stay ap Create... In mode tcp server

stay user_init After initialization , take ESP8266_AP Pattern , after 1s Clock repetition timing

void ICACHE_FLASH_ATTR user_init(void)
{
	uart_init(115200,115200);	//  Initialize the serial port baud rate 
	os_delay_us(10000);			//  Wait for the serial port to stabilize 
	os_printf("\r\n=================================================\r\n");
	os_printf("\t Project:\t%s\r\n", ProjectName);
	os_printf("\t SDK version:\t%s", system_get_sdk_version());
	os_printf("\r\n=================================================\r\n");

	// OLED Display initialization 
	//--------------------------------------------------------
	OLED_Init();							// OLED initialization 
	OLED_ShowString(0,0,"ESP8266 = AP");	// ESP8266 Pattern 
	OLED_ShowString(0,2,"IP:");				// ESP8266_IP Address 
	OLED_ShowString(0,4,"Remote  = STA");	//  Remote host mode 
	OLED_ShowString(0,6,"IP:");				//  Remote host IP Address 
	//--------------------------------------------------------

	LED_Init_JX();		// LED initialization 


	ESP8266_AP_Init_JX();			//  initialization ESP8266_AP Pattern 

	OS_Timer_1_Init_JX(1000,1);		// 1 Second timing ( repeat )
}

In the timing callback function , Inquire about AP In mode ESP8266 Of IP Address ,ESP8266 Successful acquisition IP After the address , off timer , Initialize the network connection (TCP signal communication )

//  Callback function of software timing 
//=============================================================================================================
void ICACHE_FLASH_ATTR OS_Timer_1_cb(void)
{
	struct ip_info ST_ESP8266_IP;	// IP Information structure 
	u8 ESP8266_IP[4];		//  Save in dotted decimal form IP


	wifi_get_ip_info(SOFTAP_IF,&ST_ESP8266_IP);	//  Inquire about AP In mode ESP8266 Of IP Address 

	if(ST_ESP8266_IP.ip.addr != 0 )				// ESP8266 Successful acquisition IP Address 
	{
		ESP8266_IP[0] = ST_ESP8266_IP.ip.addr;		//  dotted decimal IP The first number of  <==> addr Lower eight 
		ESP8266_IP[1] = ST_ESP8266_IP.ip.addr>>8;	//  dotted decimal IP The second number of  <==> addr Lower eight 
		ESP8266_IP[2] = ST_ESP8266_IP.ip.addr>>16;	//  dotted decimal IP The third number of  <==> addr Second highest eight 
		ESP8266_IP[3] = ST_ESP8266_IP.ip.addr>>24;	//  dotted decimal IP The fourth number of  <==> addr Top eight digit 

		//  Show ESP8266 Of IP Address 
		//-----------------------------------------------------------------------------------------------
		os_printf("ESP8266_IP = %d.%d.%d.%d\n",ESP8266_IP[0],ESP8266_IP[1],ESP8266_IP[2],ESP8266_IP[3]);
		OLED_ShowIP(24,2,ESP8266_IP);	// OLED Show ESP8266 Of IP Address 
		//-----------------------------------------------------------------------------------------------


		os_timer_disarm(&OS_Timer_1);	//  off timer 

		ESP8266_NetCon_Init_JX();		//  Initialize the network connection (TCP signal communication )
	}
}

In initializing the network connection (TCP signal communication )

Structure assignment , Set the communication protocol to TCP, And for TCP Structure requests memory , Then register the connection success callback function 、 Exception disconnect callback function , After creating TCP_server, Establish listening , Set the timeout disconnection time

//  Initialize the network connection (TCP signal communication )
//=============================================================================================================
void ICACHE_FLASH_ATTR ESP8266_NetCon_Init_JX()
{
	//  Structure assignment 
	//--------------------------------------------------------------------------
	ST_NetCon.type = ESPCONN_TCP ;				//  Communication protocol ：TCP

	ST_NetCon.proto.tcp = (esp_tcp *)os_zalloc(sizeof(esp_tcp));	//  Application memory 

	//  There is no need to set goals here IP/ port (ESP8266 As Server, There is no need to know in advance Client Of IP/ port )
	//--------------------------------------------------------------------------
	ST_NetCon.proto.tcp->local_port = 8266 ;	//  Set local port 
	//ST_NetCon.proto.tcp->remote_port = 8888;	//  Set the target port 
	//ST_NetCon.proto.tcp->remote_ip[0] = 192;	//  Set the target IP Address 
	//ST_NetCon.proto.tcp->remote_ip[1] = 168;
	//ST_NetCon.proto.tcp->remote_ip[2] = 4;
	//ST_NetCon.proto.tcp->remote_ip[3] = 2;


	//  Successfully registered connection callback function 、 Exception disconnect callback function 
	//--------------------------------------------------------------------------------------------------
	espconn_regist_connectcb(&ST_NetCon, ESP8266_TCP_Connect_Cb_JX);	//  register TCP Callback function for successful connection establishment 
	espconn_regist_reconcb(&ST_NetCon, ESP8266_TCP_Break_Cb_JX);		//  register TCP Callback function with abnormally disconnected connection 


	//  establish TCP_server, Establish listening 
	//----------------------------------------------------------
	espconn_accept(&ST_NetCon);	//  establish TCP_server, Establish listening 

	//  Please be there.  espconn_accept  after , Before the connection is established , Call this interface 
	//  If the timeout is set to  0,ESP8266_TCP_server It will never disconnect those who have not communicated with it TCP_client, It is not recommended to use .
	//---------------------------------------------------------------------------------------------------
	espconn_regist_time(&ST_NetCon, 300, 0); 	// Set the timeout disconnection time . Company = second , Maximum =7200
}

espconn_regist_time(&ST_NetCon, 300, 0);     // Set the timeout disconnection time . Company = second , Maximum =7200

Parameter 1 is the pointer of the network connection structure , Parameter 2 is the timeout time, in seconds , Parameter 3 indicates whether it is all tcp Connect , Or just now tcp Connect , Note here that if the timeout is set to 0,ESP8266_TCP_server It will never disconnect those who have not communicated with it TCP_client, It is not recommended to use .

When we successfully created server after , We 8266 Just waiting for tcp_client Propose to him tcp Connect

If tcp If the connection is successfully established , Will enter ESP8266_TCP_Connect_Cb_JX(void *arg) This callback function , Its parameter is that the pointer of the network connection structure is (void*)  type , It is necessary to replace the mandatory station with the pointer of the network connection structure (struct espconn *) type

// TCP Callback function for successful connection establishment 
//====================================================================================================================
void ICACHE_FLASH_ATTR ESP8266_TCP_Connect_Cb_JX(void *arg)
{
	espconn_regist_sentcb((struct espconn *)arg, ESP8266_WIFI_Send_Cb_JX);			//  Register the callback function for sending network data successfully 
	espconn_regist_recvcb((struct espconn *)arg, ESP8266_WIFI_Recv_Cb_JX);			//  Register the callback function for successful network data reception 
	espconn_regist_disconcb((struct espconn *)arg,ESP8266_TCP_Disconnect_Cb_JX);	//  Registration successfully disconnected TCP Connected callback function 

	os_printf("\n--------------- ESP8266_TCP_Connect_OK ---------------\n");
}

Callback function that successfully receives network data

Parameters 1： Network transmission structure espconn The pointer 、 Parameters 2： Network transmission data pointer 、 Parameters 3： Data length

void ICACHE_FLASH_ATTR ESP8266_WIFI_Recv_Cb_JX(void * arg, char * pdata, unsigned short len)
{
	struct espconn * T_arg = arg;		//  Cache network connection structure pointer 

	//  Set according to the data LED Liang Liang / destroy 
	//-------------------------------------------------------------------------------
	if(pdata[0] == 'k' || pdata[0] == 'K')	LED_ON;			//  The initial is 'k'/'K', Light on 
	else if(pdata[0] == 'g' || pdata[0] == 'G')	LED_OFF;	//  The initial is 'g'/'G', The light goes out 
	os_printf("\nESP8266_Receive_Data = %s\n",pdata);		//  The serial port prints the received data 

	/*
	//  Get remote information 
	//------------------------------------------------------------------------------------
	remot_info * P_port_info = NULL;	//  Define the remote connection information pointer 
	if(espconn_get_connection_info(T_arg, &P_port_info, 0)==ESPCONN_OK)	//  Get remote information 
	{
		T_arg->proto.tcp->remote_port  = P_port_info->remote_port;	//  Get the opposite port number 
		T_arg->proto.tcp->remote_ip[0] = P_port_info->remote_ip[0];	//  Get each other's IP Address 
		T_arg->proto.tcp->remote_ip[1] = P_port_info->remote_ip[1];
		T_arg->proto.tcp->remote_ip[2] = P_port_info->remote_ip[2];
		T_arg->proto.tcp->remote_ip[3] = P_port_info->remote_ip[3];
		//os_memcpy(T_arg->proto.tcp->remote_ip,P_port_info->remote_ip,4);	//  Memory copy 
	}
	*/

	//--------------------------------------------------------------------
	OLED_ShowIP(24,6,T_arg->proto.tcp->remote_ip);	//  Displays the remote host IP Address 
	//--------------------------------------------------------------------

	//【TCP Communication is connection oriented , When responding to the remote host, you can directly use T_arg The structure pointer points to IP Information 】
	//-----------------------------------------------------------------------------------------------
	espconn_send(T_arg,"ESP8266_WIFI_Recv_OK",os_strlen("ESP8266_WIFI_Recv_OK"));	//  Send a reply to the other party 
}

 TCP Communication is connection oriented , When responding to the remote host, you can directly use T_arg The structure pointer points to IP Information
  espconn_send(T_arg,"ESP8266_WIFI_Recv_OK",os_strlen("ESP8266_WIFI_Recv_OK"));      Send a reply to the other party

  Callback function for successfully sending network data

void ICACHE_FLASH_ATTR ESP8266_WIFI_Send_Cb_JX(void *arg)
{
	os_printf("\nESP8266_WIFI_Send_OK\n");
}

TCP Callback function for successful disconnection

void ICACHE_FLASH_ATTR ESP8266_TCP_Disconnect_Cb_JX(void *arg)
{
	os_printf("\nESP8266_TCP_Disconnect_OK\n");
}

TCP Callback function when the connection is abnormally disconnected

void ICACHE_FLASH_ATTR ESP8266_TCP_Break_Cb_JX(void *arg,sint8 err)
{
	os_printf("\nESP8266_TCP_Break\n");
}

  send out K,led Lit and 8266 Successfully received characters K, And successfully to tcp_client The reply

Explain our tcp The communication settings have been set successfully , also 8266 Also successfully created tcp_server, The network debugging assistant acts as tcp_client Has successfully and 8266 Established tcp Connect , And the two sides communicated .