STM32 Low-Layer(LL) library. Micro-sized HTTP web server for ESP8266 using AT commands.
- No external dependencies
- Pending request enqueue
- Multiple clients supported
- Flexible URI matching by pattern
- All types of request supported(GET, POST, PUT, HEAD, DELETE etc.)
- HTTP request parsing and validation
- Chunked response support
- Auto response split if size is larger than ESP8266 inner buffer
- JSON and API call ready
- No extra memory is used
How to add CPM to the project, check the link
CPMAddPackage(
NAME ESP8266Server
GITHUB_REPOSITORY ximtech/ESP8266Server
GIT_TAG origin/main)- Start project with STM32CubeMX:
- Select: Project Manager -> Advanced Settings -> USART -> LL
- Generate Code
- Add sources to project:
include_directories(${includes}
${ESP8266_SERVER_DIRECTORY}) # source directories
file(GLOB_RECURSE SOURCES ${sources}
${ESP8266_SERVER_SOURCES}) # source files
add_executable(${PROJECT_NAME}.elf ${SOURCES} ${LINKER_SCRIPT}) # executable declaration should be before libraries
target_link_libraries(${PROJECT_NAME}.elf StringUtils) # add library dependencies to project
target_link_libraries(${PROJECT_NAME}.elf HTTPServer)
target_link_libraries(${PROJECT_NAME}.elf JSON) # add if JSON is needed- Then Build -> Clean -> Rebuild Project
Provide interrupt handler
- Full example: link
/**
* @brief This function handles USART1 global interrupt.
*/
void USART1_IRQHandler(void) {
interruptCallbackUSART1();
}The following example for base application
#include "ESP8266Server.h"
#include "JSON.h"
static void handleRoot(ServerContext *context, HTTPParser *request) {
HashMap headers = request->headers;
hashMapClear(headers); // reuse parsed headers
hashMapPut(headers, "Content-Type", "text/html; charset=UTF-8"); // set custom headers
hashMapPut(headers, "Connection", "close");
sendServerResponseESP8266(context, HTTP_OK, headers, HTML_PAGE); // large char array html, tested with 12k. Auto chunked response is enabled
}
static void handleJson(ServerContext *context, HTTPParser *request) { // work with JSON
HashMap headers = request->headers;
hashMapClear(headers);
hashMapPut(headers, "Content-Type", "application/json"); // set response content type
Regex regex;
regexCompile(®ex, "\\d+");
Matcher matcher = regexMatch(®ex, request->uriPath);
char *valuePointer = &request->uriPath[matcher.foundAtIndex]; // extract path variable. Example: "/api/1234/test" -> 1234
valuePointer[matcher.matchLength] = '\0';
printf("%s\n", valuePointer);
JSONTokener jsonTokener = createEmptyJSONTokener(); // create response JSON
JSONObject rootObject = createJsonObject(&jsonTokener);
jsonObjectPut(&rootObject, "requestId", valuePointer); // set values
jsonObjectPut(&rootObject, "humidity", "86");
jsonObjectPut(&rootObject, "temperature", "23.12");
jsonObjectPut(&rootObject, "description", "text");
char buffer[ESP8266_INNER_TX_BUFFER_SIZE] = {0}; // Max buffer size for AT API is 2048
jsonObjectToStringPretty(&rootObject, buffer, ESP8266_INNER_TX_BUFFER_SIZE, 3, 0); // format JSON with idents - 3 and root level - 0
deleteJSONObject(&rootObject); // free resources
sendServerResponseESP8266(context, HTTP_OK, request->headers, buffer); // send response
}
static void handleNotFound(ServerContext *context, HTTPParser *request) {
char *message = hashMapGetOrDefault(request->queryParameters, "message", "No message sent");// get value from query params
HashMap headers = request->headers;
hashMapClear(headers);
hashMapPut(headers, "Content-Type", "text/html; charset=UTF-8");
hashMapPut(headers, "Connection", "close");
char content[200];
snprintf(content, sizeof(content), "<html><title>Not Found</title>Not found: %s</html>", request->uriPath);
sendServerResponseESP8266(context, HTTP_NOT_FOUND, headers, content);
}
int main(void) {
ServerConfiguration configuration = {0};
configuration.serverPort = 80;
configuration.serverTimeoutMs = 5000;
configuration.rxDataBufferSize = 5000;
configuration.defaultHandler = handleNotFound;
ServerContext *context = initServerESP8266(USART1, &configuration);
if (context == NULL) {
printf("Failed to initialize ESP8266\n");
return -1;
}
// Regex pattern URI
addUrlMapping(context, "^/$", HTTP_GET, handleRoot);
addUrlMapping(context, "^/api/\\d+/test$", HTTP_GET, handleJson); // Example: /api/1234/test
ServerIPConfig ipConfig = startServerESP8266(context, "SSID", "WIFI_PASSWORD");
printf("IP: %s\n", ipConfig.localIP.octetsIPv4);
while (1) {
processServerRequestsESP8266(context);
}
}