Telemetry ID Quick Reference

All Telemetry Identifiers

ID	Name	Size (bytes)	Format	Source Command
POLL	Environmental Poll	Variable	4s + I + Nf	ENV_POLL
ADCS	Attitude Determination	32	4s + 7f	GET_ORIENTATION
BME2	BME280 Environment	16	4s + 3f	GET_BME
GYRO	Gyroscope	16	4s + 3f	GET_GYRO
ACCL	Accelerometer	16	4s + 3f	GET_ACCEL
MAGN	Magnetometer	16	4s + 3f	GET_MAG
TEMP	Temperature	8	4s + i	GET_TEMP
GRAV	Gravity Vector	16	4s + 3f	GET_GRAVITY
EULR	Euler Angles	16	4s + 3f	GET_EULER
QUAT	Quaternion	20	4s + 4f	GET_QUATERNION
SOLR	Solar Panels	36	4s + 8f	GET_SOLAR
HOST	Hostname	15	4s + 11s	GET_HOSTNAME
PHOT	Photo Captured	Variable	4s + I + data	TAKE_PHOTO
OBCP	Process List	Variable	4s + text	OBC_PROCESSES
OBCC	CPU Usage	8	4s + f	OBC_CPU
OBCR	RAM Usage	8	4s + f	OBC_RAM
OBCD	Disk Usage	8	4s + f	OBC_DISK
OBCL	File Listing	Variable	4s + text	OBC_LIST_FILES
SEND	Image Data	Variable	Text	SEND_IMAGE
RETX	Retransmit Data	Variable	Text	RETRANSMIT
EPSS	EPS Status	28	4s + 5i + f	EPS_STATUS
BECN	Health Beacon	24	4s + I + 4f	BEACON_ON
XFRC	Transfer Complete	8	4s + I	(auto after SEND_IMAGE)

Response Categories

Fixed-Size Binary (struct.pack)

These packets always have the same size and are parsed using known byte offsets:

GYRO, ACCL, MAGN, GRAV, EULR  →  16 bytes (3 floats)
BME2                            →  16 bytes (3 floats)
TEMP                            →   8 bytes (1 int)
QUAT                            →  20 bytes (4 floats)
ADCS                            →  32 bytes (7 floats)
SOLR                            →  36 bytes (8 floats)
EPSS                            →  28 bytes (5 ints + 1 float)
OBCC, OBCR, OBCD               →   8 bytes (1 float)
HOST                            →  15 bytes (11-char string)
BECN                            →  24 bytes (1 uint + 4 floats)
XFRC                            →   8 bytes (1 uint)

Multi-Packet Chunked (newline-delimited)

These are split across multiple radio packets. The ground station accumulates chunks and flushes after a 1-second timeout:

OBCP  →  Process list (chunked text)
OBCL  →  File listing (chunked text)

Image Transfer (newline-delimited)

SEND  →  Base64 image chunk + 8-digit metadata
RETX  →  Retransmitted image chunk

Variable-Length Binary

POLL  →  Length-prefixed sensor data
PHOT  →  Length-prefixed filename

Struct Format Codes

Code	Python Type	Size	JavaScript Equivalent
s	char	1 byte	TextDecoder
i	int32	4 bytes	DataView.getInt32(offset, true)
I	uint32	4 bytes	DataView.getUint32(offset, true)
f	float32	4 bytes	DataView.getFloat32(offset, true)

All multi-byte values use little-endian byte order (the true parameter in JavaScript DataView methods).