Configuration Macros

All macros live in ostx_config.h (or set by CMake/Arduino IDE). Set them before including any <OSynaptic-TX.h> header.

Buffer Sizes

Macro	Default	Unit	Description
`OSTX_PACKET_MAX`	`96`	bytes	Maximum output packet size. Must be large enough for header + longest possible body
`OSTX_ID_MAX`	`9`	bytes	Sensor ID max length (including NUL); default allows up to 8 chars
`OSTX_UNIT_MAX`	`9`	bytes	Unit string max length (including NUL)

Macro	Default	Description
`OSTX_VALUE_SCALE`	`10000`	Fixed-point scale factor. `scaled = real_value × OSTX_VALUE_SCALE`

You can set this to any power of ten. Example: 100 for 2-decimal-place precision saves approximately 1-2 Base62 digits per packet.

Macro	Default	Description
`OSTX_NO_TIMESTAMP`	`0`	Set to `1` to omit timestamp fields from struct and packet. Saves ~20 B Flash + 4 B stack

When OSTX_NO_TIMESTAMP=1, pass 0 for the ts_sec argument; the library ignores the value and the TS_SEC field is zeroed in the packet.

Macro	Default	Description
`OSTX_NO_STATIC`	`0`	Set to `1` to exclude Tier B (static descriptor API)
`OSTX_NO_STREAM`	`0`	Set to `1` to exclude Tier C (streaming callback API)
`OSTX_DISABLE_B62_TABLE`	`0`	Not applicable — TX uses a lookup-table encoder for speed

Profile	Defines	Flash	Stack	Static RAM
Full (all tiers)	defaults	~760 B	~137 B (Tier A)	96 B
Tier B only	`OSTX_NO_STREAM=1`	~430 B	~51 B	96 B
Tier C only	`OSTX_NO_STATIC=1`	~600 B	~21 B	0 B
No timestamp	`OSTX_NO_TIMESTAMP=1`	~740 B	~117 B	96 B
Minimal	`OSTX_NO_STATIC=1 OSTX_NO_STREAM=1`	~600 B	~137 B	96 B (Tier A only)

target_compile_definitions(my_sensor PRIVATE
    OSTX_NO_TIMESTAMP=1
    OSTX_NO_STATIC=1
)

Add to Sketch > Sketch Properties (Arduino 3.x) or define before the include:

#define OSTX_NO_TIMESTAMP 1
#define OSTX_NO_STATIC    1
#include <OSynaptic-TX.h>