Payload Quick Reference

Payload fields

Fields from the payload contract payload contract
JSON schema for telemetry (`type=connectivity`) and event (`type=button`, `event=press`) MQTT messages. for MQTT MQTT
Message Queuing Telemetry Transport — lightweight publish/subscribe protocol used between ESP32 and AWS IoT Core. telemetry and events:

Field Name	Data Type	Example Value
device_id	string	esp32-c
ts	integer (epoch seconds)	1782117400
type (telemetry)	string	connectivity
rssi	integer (dBm)	-54
uptime_s	integer (seconds)	73987
heap_free	integer (bytes)	244916
chip_temp_c	number (Celsius)	29.5
chip_model	string	ESP32-S3
cpu_mhz	integer	240
flash_bytes	integer (bytes)	16777216
wifi_ssid	string	your-wifi-ssid
wifi_status	integer	3 (connected)
wifi_channel	integer	10
wifi_ip	string (IPv4)	192.168.12.2
wifi_gateway	string (IPv4)	192.168.12.1
wifi_dns	string (IPv4)	192.168.99.1
clock_offset_ms	integer (milliseconds)	-62
type (event)	string	button
event	string	press