Espressif Systems ESP8266EX - Compiling, Downloading, and Debugging; 4.1. Set Up the Compiling Environment

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3. Sample Codes
printf("heap_size󰲧%d\n”,system_get_free_heap_size());
6. When the SSL authentication function is required:
• If not using SPIFFS file system, please run python script esp_iot_sdk_freertos\tools\
make_cert.py, generate esp_ca_cert.bin, and write it into the flash.
Below is an example showing how to read information about the SSL encryption key
and certificate from the flash.
uint8󰲧flash_offset󰲧=󰲧0x78;󰲧󰲧󰲧//󰲧Example󰲧:󰲧Flash󰲧address󰲧0x78000
if󰲧(ssl_obj_option_load(ssl_ctx,󰲧SSL_OBJ_RSA_KEY,󰲧“XX.key”,󰲧password,󰲧flash_offset)){
󰲧󰲧󰲧󰲧printf("Error:󰲧the󰲧Private󰲧key󰲧is󰲧undefined.\n");
}
if󰲧(ssl_obj_option_load(ssl_ctx,󰲧SSL_OBJ_X509_CERT,󰲧“XX.cer”,󰲧NULL,󰲧flash_offset)){
󰲧󰲧󰲧󰲧printf("Error:󰲧the󰲧Certificate󰲧is󰲧undefined.\n");
}
• If using SPIFFS file system, please run the tool spiffy (https://github.com/xlfe/spiffy.
Please note that the spiffs_config.h of this tool has to be the same as the one in the
RTOS SDK). Then generate spiffs_rom.bin, and write it into the flash; for details on
this process please refer to the example of esp_spiffs_init.
Below is an example showing how to read information about the SSL encryption key
and certificate from the flash using SPIFFS.
if󰲧(ssl_obj_load(ssl_ctx,󰲧SSL_OBJ_RSA_KEY,󰲧“XX.key”,󰲧password)){
󰲧󰲧󰲧󰲧printf("Error:󰲧the󰲧Private󰲧key󰲧is󰲧undefined.\n");
}
if󰲧(ssl_obj_load(ssl_ctx,󰲧SSL_OBJ_X509_CERT,󰲧“XX.cer”,󰲧NULL)){
󰲧󰲧󰲧󰲧printf("Error:󰲧the󰲧Certificate󰲧is󰲧undefined.\n");
}
7. Start a handshake with the SSL client.
ssl󰲧=󰲧ssl_client_new(ssl_ctx,󰲧client_fd,󰲧NULL,󰲧0);
if󰲧(ssl󰲧!=󰲧NULL){
󰲧󰲧󰲧󰲧printf("client󰲧handshake󰲧start\n");
}
8. Check the status of the SSL connection.
if󰲧((res󰲧=󰲧ssl_handshake_status(ssl))󰲧==󰲧SSL_OK){
󰲧󰲧󰲧󰲧…󰲧…
}
9. If the handshake is successful, then the certificate can be released and more memory
space will be available.
Espressif
! /!32 37
2017.05