SIMCOM A76xxx ESP32 HTTPS/SSL/TLS Driver

This repository contains a device driver for the SIMCOM module. The driver is located under components/_driver_/simcom folder. There is a small example for both GET and POST methods. The example is using the PostData API which is a very simple and intuitive way to publish and visualize sensor data.

Using the driver

Attach the modem to the ESP32 and change the components/_config_/include/board_config.h to match your hardware setup pins. Replace or add any necessary root certificate for your application.

Request options

typedef struct
{
    char *root_cert_filename;
    const char *root_cert;
    bool force_write_cert;
    bool force_insecure;
    SIMCOM_SSL_Request_Methods_t ssl_request_method;
    char *host_server;
    char *endpoint;
    char *payload;
    char * headers;
} SIMCOM_SSL_Request_t;

Option	Description
root_cert_filename	Name of the certificate. Example: postData.pem
root_cert	Pointer to the certificate.
force_write_cert	Force a write even if the cert file already exists in memory of the simcom.
force_insecure	Force the connection to be insecure (it will not verify the server).
ssl_request_method	Request method. It can be POST or GET.
host_server	Host server. Example: api.postdata.cloud
endpoint	Endpoint. Example: /add/simcom
payload	Payload to post. Example: {"temperature":22.5}
headers	Extra required headers. Example: {"authorization":token}

How to build PlatformIO based project

1. Install PlatformIO Core
2. Run these commands:

# Change directory to example
$ cd a7672e_4g_modem_esp32

# Build project
$ pio run

# Upload firmware to specific port
$ pio run --target upload --upload-port /dev/ttyUSB0

# Build specific environment
$ pio run -e esp32dev

# Upload firmware for the specific environment
$ pio run -e esp32dev --target upload

# Clean build files
$ pio run --target clean