Data Logger
The data logger API is the common Infuse-IoT abstraction for data storage.
Storage backends can be either persistent (e.g. Flash, SD card) or transient
(e.g. Bluetooth, LTE). The API is block-oriented, with each block having a
defined data type (infuse_type) and size. Each block is self-contained
and can therefore be parsed in isolation.
Logger Types
Peristent Loggers
Persistent loggers save data to some location that enables data read-back. This is typically a SPI-NOR flash device or an external SD card (for high datarate applications). Blocks are typically 512 bytes, with each block containing 2 bytes of overhead for metadata (Wrap index and block type).
Transient Loggers
Transient loggers can handle data using the same API as the persistent loggers, but once written the data cannot be read back. These are typically wireless interfaces that implement the data logger API to simplify the implementation of higher level code.
Higher-Level Interfaces
The data logger API is a low level interface which only handles complete blocks. Most application usage of this API will be through higher-level abstractions which handle constructing blocks in a manner that makes sense for the block type.
TDF Data Logger: Tagged Data Format logging