Sensor data pipeline

Collect data from sensor and send the readings for further processing.

Environment and dependency

• cURL: apt install libcurl4-gnutls-dev
• JSON: apt install libjson-c-dev
• libiotctrl: GPIO support
• Enable I2C interface with raspi-config.
• Check status of I2C device with dmesg | grep i2c.

Design

Essentially this project is a simple framework that does the following:

// Initialize two context objects
void* ctx = collection_init();
void* pc_ctx = post_collection_init();

while (1) {
    // The data collected from sensors or whatever peripherals will be saved to ctx
    collection(ctx);
    // Then ctx and pc_ctx will be handed to post_collection(), it can display
    // the data on a 7seg digital tube or upload them to ElasticSearch or whatever.
    post_collection(ctx, pc_ctx);
}

post_collection_destroy(pc_ctx);
collection_destroy(ctx);