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myesp32tests/examples/thingspeak.c
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/* | |
Big thanks for MakerAsia for dns example, and stackoverflow.com/questions/26192758/how-can-i-send-a-simple-http-request-with-a-lwip-stack | |
This program is free software: you can redistribute it and/or modify | |
it under the terms of the GNU General Public License as published by | |
the Free Software Foundation, either version 3 of the License, or | |
(at your option) any later version. | |
This program is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
GNU General Public License for more details. | |
You should have received a copy of the GNU General Public License | |
along with this program. If not, see <http://www.gnu.org/licenses/>. | |
*/ | |
#include <stdio.h> | |
#include "freertos/FreeRTOS.h" | |
#include "freertos/task.h" | |
#include "lwip/tcp.h" | |
#include "lwip/ip4_addr.h" | |
#include "string.h" | |
#include "freertos/event_groups.h" | |
#include "esp_system.h" | |
#include "esp_wifi.h" | |
#include "esp_event_loop.h" | |
#include "esp_log.h" | |
#include "nvs_flash.h" | |
#include "lwip/inet.h" | |
struct tcp_pcb *testpcb; | |
#define EXAMPLE_WIFI_SSID "SSID" | |
#define EXAMPLE_WIFI_PASS "PASS" | |
static EventGroupHandle_t wifi_event_group; | |
const int CONNECTED_BIT = BIT0; | |
static esp_err_t event_handler(void *ctx, system_event_t *event) | |
{ | |
switch(event->event_id) { | |
case SYSTEM_EVENT_STA_START: | |
esp_wifi_connect(); | |
break; | |
case SYSTEM_EVENT_STA_GOT_IP: | |
xEventGroupSetBits(wifi_event_group, CONNECTED_BIT); | |
break; | |
case SYSTEM_EVENT_STA_DISCONNECTED: | |
/* This is a workaround as ESP32 WiFi libs don't currently | |
auto-reassociate. */ | |
esp_wifi_connect(); | |
xEventGroupClearBits(wifi_event_group, CONNECTED_BIT); | |
break; | |
default: | |
break; | |
} | |
return ESP_OK; | |
} | |
static void initialise_wifi(void) | |
{ | |
tcpip_adapter_init(); | |
wifi_event_group = xEventGroupCreate(); | |
ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) ); | |
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT(); | |
ESP_ERROR_CHECK( esp_wifi_init(&cfg) ); | |
ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) ); | |
wifi_config_t wifi_config = { | |
.sta = { | |
.ssid = EXAMPLE_WIFI_SSID, | |
.password = EXAMPLE_WIFI_PASS, | |
}, | |
}; | |
ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) ); | |
ESP_ERROR_CHECK( esp_wifi_set_config(WIFI_IF_STA, &wifi_config) ); | |
ESP_ERROR_CHECK( esp_wifi_start() ); | |
} | |
err_t tcpRecvCallback(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err) | |
{ | |
printf("Data recieved.\n"); | |
if (p == NULL) { | |
printf("The remote host closed the connection.\n"); | |
printf("Now I'm closing the connection.\n"); | |
return ERR_ABRT; | |
} else { | |
printf("Number of pbufs %d\n", pbuf_clen(p)); | |
printf("Contents of pbuf %s\n", (char *)p->payload); | |
} | |
return 0; | |
} | |
uint32_t tcp_send_packet(void) | |
{ | |
char *string = "HEAD /update.php?api_key=<key>&field1=<data> HTTP/1.0\r\nHost: api.thingspeak.com\r\n\r\n "; | |
err_t error; | |
/* push to buffer */ | |
error = tcp_write(testpcb, string, strlen(string), TCP_WRITE_FLAG_COPY); | |
if (error) { | |
printf("ERROR: Code: %d (tcp_send_packet :: tcp_write)\n", error); | |
return 1; | |
} | |
/* now send */ | |
error = tcp_output(testpcb); | |
if (error) { | |
printf("ERROR: Code: %d (tcp_send_packet :: tcp_output)\n", error); | |
return 1; | |
} | |
return 0; | |
} | |
err_t connectCallback(void *arg, struct tcp_pcb *tpcb, err_t err) | |
{ | |
printf("Connection Established.\n"); | |
printf("Now sending a packet\n"); | |
tcp_send_packet(); | |
return 0; | |
} | |
void tcp_setup(void) | |
{ | |
uint32_t data = 0xdeadbeef; | |
/* create an ip */ | |
ip_addr_t ip; | |
IP_ADDR4(&ip, 184, 106, 153, 149); //IP of my PHP server | |
/* create the control block */ | |
testpcb = tcp_new(); //testpcb is a global struct tcp_pcb | |
// as defined by lwIP | |
/* dummy data to pass to callbacks*/ | |
tcp_arg(testpcb, &data); | |
/* register callbacks with the pcb */ | |
tcp_err(testpcb, NULL); | |
tcp_recv(testpcb, tcpRecvCallback); | |
tcp_sent(testpcb, NULL); | |
/* now connect */ | |
tcp_connect(testpcb, &ip, 80, connectCallback); | |
} | |
void mainTask(void *pvParameters){ | |
tcp_setup(); | |
while (1) { | |
vTaskDelay(1000 / portTICK_PERIOD_MS); | |
} | |
} | |
void app_main() | |
{ | |
nvs_flash_init(); | |
system_init(); | |
initialise_wifi(); | |
xTaskCreatePinnedToCore(&mainTask, "mainTask", 2048, NULL, 5, NULL, 0); | |
} |