Example for connections in access point mode? #131

tommasoclini · 2023-09-13T19:17:45Z

tommasoclini
Sep 13, 2023

I'm having trouble with connections in AP mode, this is the "flow" of my code:

initialize LwESP library
set Wi-Fi AP mode
configure the AP
start a UDP connection
The problem occurs at step 4, if I define LWESP_CFG_MODE_STATION to 1(default), I get error 9, if I define it to 0, I get error 2.
Here's my code(I'm using a nucleo f411re with an esp32-wroom-32), am I doing something wrong?:

void Startinit_thread(void argument) {
/ USER CODE BEGIN Startinit_thread */
{
lwespr_t res;
if ((res = lwesp_init(examples_common_lwesp_callback_func, 1)) != lwespOK) {
printf("Failed initializing LwESP, error code: %i, stopping\r\n", res);
Error_Handler();
}

lwesp_evt_register(lwesp_global_events_func);

/* Enable access point only mode */
if ((res = lwesp_set_wifi_mode(LWESP_MODE_AP, NULL, NULL, 1)) == lwespOK) {
		printf("ESP set to access-point-only mode\r\n");
} else {
		printf("Problems setting ESP to access-point-only mode: %d\r\n", (int)res);
		Error_Handler();
}

/* Configure access point */
res = lwesp_ap_set_config(AP_SSID, AP_PASSWD, 13, LWESP_ECN_WPA2_PSK, 5, 0, NULL, NULL, 1);
if (res == lwespOK) {
		printf("Access point configured!\r\n");
} else {
		printf("Cannot configure access point!\r\n");
		Error_Handler();
}

lwesp_ip_t ap_ip;

res = lwesp_ap_getip(&ap_ip, NULL, NULL, NULL, NULL, 1);
if (res != lwespOK){
	printf("Error(%d) while trying to retrieve ap ip information\r\n", res);
	Error_Handler();
} else {
	utils_print_ip("AP IP address: ", &ap_ip, "");
}

res = lwesp_conn_start(NULL, LWESP_CONN_TYPE_UDP, REMOTE_HOST, 8888, NULL, conn_callback_func, 1);
if (res != lwespOK){
	printf("Cannot start connection, error code: %d\r\n", res);
	Error_Handler();
}

}
for (;;){
	osDelay(1000);
}
/* USER CODE END Startinit_thread */

}

lwespr_t lwesp_global_events_func(lwesp_evt_t *evt) {
switch (lwesp_evt_get_type(evt)) {
case LWESP_EVT_AP_CONNECTED_STA: {
lwesp_mac_t *mac = lwesp_evt_ap_connected_sta_get_mac(evt);
utils_print_mac("New station connected to access point with MAC address: ",
mac, "\r\n");
break;
}
case LWESP_EVT_AP_IP_STA: {
lwesp_mac_t *mac = lwesp_evt_ap_ip_sta_get_mac(evt);
lwesp_ip_t *ip = lwesp_evt_ap_ip_sta_get_ip(evt);

	utils_print_ip("IP ", ip, " assigned to station with MAC address: ");
	utils_print_mac(NULL, mac, "\r\n");
	break;
}
case LWESP_EVT_AP_DISCONNECTED_STA: {
	lwesp_mac_t *mac = lwesp_evt_ap_disconnected_sta_get_mac(evt);
	utils_print_mac("Station disconnected from access point with MAC address: ",
			mac, "\r\n");
	break;
}
default:
	break;
}
return lwespOK;

}

lwespr_t conn_callback_func(lwesp_evt_t* evt) {
lwesp_conn_p conn;
//lwespr_t res;
uint8_t conn_num;

conn = lwesp_conn_get_from_evt(evt);          /* Get connection handle from event */
if (conn == NULL) {
    return lwespERR;
}
conn_num = lwesp_conn_getnum(conn);           /* Get connection number for identification */
switch (lwesp_evt_get_type(evt)) {
    case LWESP_EVT_CONN_ACTIVE: {             /* Connection just active */
        printf("Connection %d active!\r\n", (int)conn_num);
        break;
    }
    case LWESP_EVT_CONN_CLOSE: {              /* Connection closed */
        if (lwesp_evt_conn_close_is_forced(evt)) {
            printf("Connection %d closed by client!\r\n", (int)conn_num);
        } else {
            printf("Connection %d closed by remote side!\r\n", (int)conn_num);
        }
        break;
    }
    case LWESP_EVT_CONN_SEND: {               /* Data send event */
        lwespr_t res = lwesp_evt_conn_send_get_result(evt);
        if (res == lwespOK) {
            printf("Data sent successfully on connection %d...waiting to receive data from remote side...\r\n", (int)conn_num);
        } else {
            printf("Error while sending data on connection %d!\r\n", (int)conn_num);
        }
        break;
    }
    case LWESP_EVT_CONN_RECV: {               /* Data received from remote side */
        lwesp_pbuf_p pbuf = lwesp_evt_conn_recv_get_buff(evt);
        lwesp_conn_recved(conn, pbuf);        /* Notify stack about received pbuf */
        size_t pbuf_size = lwesp_pbuf_length(pbuf, 1);
        printf("Received %d bytes on connection %d: %.*s\r\n", (int)pbuf_size, (int)conn_num, (int)pbuf_size, (char*)lwesp_pbuf_get_linear_addr(pbuf, 0, NULL));
        break;
    }
    case LWESP_EVT_CONN_ERROR: {              /* Error connecting to server */
        const char* host = lwesp_evt_conn_error_get_host(evt);
        lwesp_port_t port = lwesp_evt_conn_error_get_port(evt);
        printf("Error connecting to %s:%d\r\n", host, (int)port);
        break;
    }
    default:
        break;
}
return lwespOK;

}

MaJerle · 2023-09-13T19:28:36Z

MaJerle
Sep 13, 2023
Maintainer

You cannot start connection if you are not connected to a wifi access point.

14 replies

tommasoclini Sep 17, 2023
Author

When sending commands manually, it also works with a dummy IP address, I don't think that's the problem:
AT+CWMODE=2
AT+CWMODE=2

OK
AT+CWSAP="AP_SSID","",5,0
AT+CWSAP="AP_SSID","",5,0

OK
AT+CIPSTART="UDP","0.0.0.0",8888,8888
AT+CIPSTART="UDP","0.0.0.0",8888,8888
+LINK_CONN:0,0,"UDP",0,"0.0.0.0",8888,8888

OK
+STA_CONNECTED:"e8:84:a5:8e:60:8e"
+DIST_STA_IP:"e8:84:a5:8e:60:8e","192.168.4.2"

+IPD,11:MESSAGE_0

+IPD,11:MESSAGE_1

+IPD,11:MESSAGE_2
Here's the logs from the stm32, now it waits for the sta to connect to the ap:
Library initialized!
Device reset detected!
Device reset detected!
Device reset detected!
ESP set to access-point-only mode
Global Event no. 14
Access point configured!
Global Event no. 14
Global Event no. 14
Global Event no. 14
Global Event no. 14
Global Event no. 14
Global Event no. 14
Global Event no. 14
New station connected to access point with MAC address: E8:84:A5:8E:60:8E

IP 192.168.4.2
assigned to station with MAC address: E8:84:A5:8E:60:8E

Failed to start connection, error no. 2
Global Event no. 14
Global Event no. 14
Global Event no. 14
Global Event no. 14
Global Event no. 14

MaJerle Sep 17, 2023
Maintainer

You should always wait for station to connect, then start connection. You are doing the opposite. This may, or may not work.

tommasoclini Sep 17, 2023
Author

But as you can see in the logs, I made it wait for the STA to connect and then start the connection

MaJerle Sep 17, 2023
Maintainer

You have not:

AT+CIPSTART="UDP","0.0.0.0",8888,8888
AT+CIPSTART="UDP","0.0.0.0",8888,8888
+LINK_CONN:0,0,"UDP",0,"0.0.0.0",8888,8888

OK
+STA_CONNECTED:"e8:84:a5:8e:60:8e"
+DIST_STA_IP:"e8:84:a5:8e:60:8e","192.168.4.2"

+IPD,11:MESSAGE_0

tommasoclini Sep 17, 2023
Author

I'm sorry, I meant the stm32 logs, in the logs you are referring I did like this to demonstrare that the esp is capable of receiving even if the connection is started before the station connects and the ip is not valid.
In the first logs I am manually sending commands with an usb to uart converted, in the second case, it's the stm32 that is susing lwesp

tommasoclini · 2023-09-25T20:58:28Z

tommasoclini
Sep 25, 2023
Author

So, how should I start a UDP transmission when the esp32 is the AP itself? In the comment where I showed the logs, they were two separate logs, as described in this comment:

I'm sorry, I meant the stm32 logs, in the logs you are referring I did like this to demonstrare that the esp is capable of receiving even if the connection is started before the station connects and the ip is not valid. In the first logs I am manually sending commands with an usb to uart converted, in the second case, it's the stm32 that is susing lwesp

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Example for connections in access point mode? #131

tommasoclini Sep 13, 2023

Replies: 2 comments · 14 replies

MaJerle Sep 13, 2023 Maintainer

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