Web Variables

Web variables 'web vars' are special expressions, that are provided by the template engine and can be used to render a variety of information about the system state with the Templates feature.

How to use this document

The main content (reference of available web vars) is organized into multiple lists by their respective table structure. At the end, there is a list of Simple Web vars, that dont belong to a table structure.

Simple variables and table items have a data type.

Refer to the table of contents for more information.

After the web variables reference, you will find glossaries of used flags and used data formats/types.

info

A machine readable reference of all available web variables in the form of a .json file (e.g. for use by LLMs) is available here.

Web Variables Reference

Table of Contents

Table	Description
webvars	Simple web variables
changetab	Table of changes that are stored in the database in flash.
filetab	The filetab table contains the installed content files.
fwtab	The fwtab table contains information about the two firmware buffers.
histotab	The histotab table contains the results of the most recently queried history. The table is generated dynamically from the parameters of the query.
inputtab	Table of inputs
logtab	The logtab table contains the 8 most recent syslog notifications.
netiftab	The netiftab table contains information about the two network interfaces.
outputtab	Table of outputs
pushtab	Table of destinations for HTTP Push
sensortab	The sensortab table contains information on up to 16 sensors.
watchtab	Table of Watchdogs

webvars

Variable	Description	Flags	Format
abnormal_conditions	Number of sensor alarms and triggered watchdogs	PUBLIC, RONLY	uint32
admin_name	Name of admin user		char[]
admin_pwd	Variable for changing the password	RONLY	char[]
admin_pwd2	Variable for changing the password for comparison with admin_pwd	RONLY	char[]
anon_read	Should reading be possible without login		bool
api_key	API key for HTTP requests, like Box2Box	RONLY	char[]
ca_cert_status	Has a CA certificate been uploaded	RONLY	bool
changes_start	Time stamp of oldest recorded entry in changetab	PUBLIC, RONLY	ts
changetab_count	Number of stored changes. Can be lower than loop.length, if entries at start have been deleted.	PUBLIC, RONLY	uint32
changetab_max	Index of newest change	PUBLIC, RONLY	uint32
changetab_min	Index of oldest change	PUBLIC, RONLY	uint32
cmnty_read	SNMP Community for read-only access		char[15]
cmnty_trap	SNMP Community for traps		char[15]
cmnty_write	SNMP Community for write access		char[15]
config_usage	The configuration's current size in percent	RONLY	char[]
csrf_token	Random text, which is generated once per session and must be included in many POST requests, to prevent CSRF attacks	PUBLIC, RONLY	char[]
db_usage	Current database usage in percent	PUBLIC, RONLY	int32
db_usage_changes	Current database usage for changes in percent	PUBLIC, RONLY	int32
db_usage_history	Current database usage for sensor data in percent	PUBLIC, RONLY	int32
db_usage_syslog	Current database usage for syslog messages in percent	PUBLIC, RONLY	int32
db_usage_unknown	Current database usage for unknown data in percent	PUBLIC, RONLY	int32
db_usage_unknown_blocks	Current database usage for unknown data in blocks	PUBLIC, RONLY	int32
dev_type	Type of device, e.g. "310"	PUBLIC, RONLY	char[]
fs_has_space	New files can be uploaded in filesystem	RONLY	bool
fw_dev		RONLY
fw_manufacturer	Producer of the active firmware	PUBLIC, RONLY	char[]
fw_name	Name of the active firmware	PUBLIC, RONLY	char[]
fw_version	Version of the active firmware	PUBLIC, RONLY	char[]
gmt_offset	Difference between local time and UTC in seconds, including summer time, if active	PUBLIC, RONLY	int32
gmt_offset_dst	Difference between local time and UTC in seconds, if summer time is active	PUBLIC, RONLY	int32
gmt_offset_normal	Difference between local time and UTC in seconds, if normal time is active	PUBLIC, RONLY	int32
has_password	Has admin user password	PUBLIC, RONLY	bool
has_simulated_network_inputs		NEEDS_REBOOT
has_simulated_sensors
histo_rate	Logging rate in seconds (only full minutes)	PUBLIC	uint32
histo_rate_m	Logging rate in minutes	PUBLIC	uint32
histo_start	Time stamp of the oldest recorded data	PUBLIC, RONLY	ts
histotab_count	Number of stored sensor data. Can be lower than loop.length, if entries at start have been deleted.	PUBLIC, RONLY	uint32
histotab_max	Index of newest measurement	PUBLIC, RONLY	uint32
histotab_min	Index of oldest measurement	PUBLIC, RONLY	uint32
hostname	Name of the device	PUBLIC	char[15]
http_host	Host used for current HTTP request	PUBLIC, RONLY	char[]
https_active	Is TLS used for current HTTP request	PUBLIC, RONLY	bool
https_redirect	Redirect to HTTPS enabled	PUBLIC, NEEDS_REBOOT	bool
hw_fail_str	Error message for detected hardware problems	PUBLIC, RONLY	char[]
icons_url		PUBLIC, RONLY
is_admin	Is current user admin	PUBLIC, RONLY	bool
lang	Index of language settings 0: English 1: German	PUBLIC	int32
led_brn	Dimming level of LED in normal state		uint16
mailtab_addr	Email address of receiver		char[63]
mailtab_ena	Sending of emails enabled		bool
mailtab_tpl	Name of template file for emails		char[]
mb_ena	Modbus activated		check
mb_wrprot	Modbus is read-only		check
memfree_kb	Free RAM in kilobytes	PUBLIC, RONLY	uint32
memfree_min_kb	Minimal free RAM in kilobytes	PUBLIC, RONLY	uint32
memusage	Current usage of RAM in percent	PUBLIC, RONLY	char[]
memusage_max	Maximum usage of RAM in percent	PUBLIC, RONLY	char[]
menu_content		PUBLIC, RONLY
mqtt_broker	Hostname or IP address of the MQTT broker		char[63]
mqtt_client_id	Client ID, that is sent to the broker		char[23]
mqtt_ena	MQTT activated		check
mqtt_interval	Update rate in minutes for sensor data		uint32
mqtt_keep_alive	Keep alive value, which is sent during connecting to MQTT. The value specifies the maximum time allowed between messages from device to broker. Pings are used, so the device sends enough messages to fulfill this.		uint16
mqtt_last_will_connect_message	Message that will be sent at connection for mqtt_last_will_topic		char[]
mqtt_last_will_message	Last will message. See mqtt_last_will_topic		char[]
mqtt_last_will_topic	Last will topic. If mqtt_last_will_message and mqtt_last_will_topic are set, then both are sent to the broker while connecting. The broker will send the message, when the device is not connected any more.		char[]
mqtt_password	Password for MQTT		char[31]
mqtt_port	Port of the MQTT broker		uint16
mqtt_retain_inputs	Set retain flag for messages for inputs		bool
mqtt_retain_last_will	Set retain flag for last will		bool
mqtt_retain_outputs	Set retain flag for messages for outputs		bool
mqtt_retain_sensors	Set retain flag for messages for sensors		bool
mqtt_retain_watchdogs	Set retain flag for messages for watchdogs		bool
mqtt_send_reboot	Send messages with current state after reboot		bool
mqtt_status	State of MQTT connection	RONLY	int32
mqtt_tls	Use TLS for MQTT connection		bool
mqtt_topic_prefix	Prefix used for MQTT topics		char[]
mqtt_user	User for MQTT	PUBLIC	char[31]
netif	Active network interface, "ETH", "WLAN" or "WLAN AP"	RONLY	char[]
ntp_ena	Time synchronisation with NTP enabled		bool
ntpd	NTP server's hostname or IP address		char[31]
remotetab_api_key	API key for control of other device using Box2Box		char[]
remotetab_ena	Box2Box enabled		bool
remotetab_flags	Bit flags for Box2Box		uint32
remotetab_output_count	Number of outputs of other device		uint32
remotetab_pulse_flags	Bit flags indicating which outputs use a pulse.		uint32
remotetab_send_reboot	Send notifications after Reboot for current state		bool
remotetab_url	URL used for changes of other device		char[]
reset_req	Reboot required	PUBLIC, RONLY	bool
server_cert_status	Has a TLS server certificate been uploaded	RONLY	bool
server_key_status	Has a TLS server key been uploaded	RONLY	bool
smtptab_hostname	Name of the SMTP server		char[]
smtptab_login	Login name		char[]
smtptab_password	Login password		char[]
smtptab_port	SMTP server port		uint16
smtptab_sender	Sender address		char[]
snmp_ena	SNMPv1/v2c activated		check
snmpd	SNMP server's hostname or IP address		char[]
syscontact	Responsible person, see SNMP OID 1.3.6.1.2.1.1.4	PUBLIC	char[63]
sysdate	Current date (local)	PUBLIC, RONLY	date
sysgmdate	Current date (UTC)	PUBLIC, RONLY	date
sysgmtime	Current time (UTC)	PUBLIC, RONLY	time
syslocation	Location of the device, see SNMP OID 1.3.6.1.2.1.1.6	PUBLIC	char[63]
systime	Current time (local)	PUBLIC, RONLY	time
systimestamp	Time stamp of current local time	PUBLIC, RONLY	ts
timerange_end	End timestamp configured with function timerange after normalisation	PUBLIC, RONLY	ts
timerange_start	Start timestamp configured with function timerange after normalisation	PUBLIC, RONLY	ts
timerange_step	Step value configured with function timerange after normalisation	PUBLIC, RONLY	uint32
timezone	Current timezone in POSIX TZ format	PUBLIC	char[]
timezone_input		RONLY
uptime	Time since boot in days, hours, minutes and seconds	PUBLIC, RONLY	[Dd Hh Mm Ss](#format-dd hh mm ss)
uptime_d	Full days since last boot	PUBLIC, RONLY	uint
uptime_h	Hours past full days since last boot	PUBLIC, RONLY	uint
uptime_m	Minutes past full hours since last boot	PUBLIC, RONLY	uint
uptime_s	Seconds past full minute since last boot	PUBLIC, RONLY	uint
uri	URI of current HTTP request	PUBLIC, RONLY	char[]
uri_path	Path in URI of current HTTP request	PUBLIC, RONLY	char[]
user	Current user	RONLY	char[]
wlan_ap_ena	WLAN access point enabled	NEEDS_REBOOT	bool
wlan_ap_name	Name of WLAN access point (SSID)	NEEDS_REBOOT	char[]
wlan_ap_pass	WLAN access point password	NEEDS_REBOOT	char[]
wlan_ap_secu	Security of WLAN access point	NEEDS_REBOOT	uint16
wlan_ap_secu_input		RONLY
wlan_ap_sta_list	List of stations connected to WLAN access point	RONLY	char[]
wlan_ena	WLAN enabled		bool
wlan_name	Name of WiFi network (SSID)	PUBLIC	char[32]
wlan_pass	Passphrase for Wifi network		char[64]
wlan_secu	Security of WiFi network * 0: Unknown * 1: WEP-OPEN * 2: WEP-PSK * 3: WEP-SHARED * 4: WPA-PSK-TKIP * 5: WPA-PSK-AES * 6: WPA2-PSK-AES * 7: WPA2-PSK-TKIP * 8: WPA2-PSK-MIXED		uint16
wlan_secu_input		RONLY

changetab

Variable	Description	Flags	Format
changetab_date	Date of change (local time)	PUBLIC, RONLY	date
changetab_desc	Description of change	PUBLIC, RONLY	char[]
changetab_events_json	Events as JSON	PUBLIC, RONLY	char[]
changetab_flags	Bit flags * Bit 0: First value after system start * Bit 1: Internal: Values are stored as difference * Bit 2: There is an event * Bit 3: Internal: Previous input states are explicitly stored * Bit 4: Internal: Previous output states are explicitly stored * Bit 5: Internal: Previous watchdog states are explicitly stored * Bit 8: There is a database error (not stored) * Bit 9: The first entry in a time interval is a reboot or database error (only with timerange) * Bit 10: The next entry after a time interval is a reboot or database error (only with timerange)	PUBLIC, RONLY	uint32
changetab_gmdate	Date of change (UTC)	PUBLIC, RONLY	date
changetab_gmt_offset	Difference between local time and GMT in seconds, including summer time, if active	PUBLIC, RONLY	int32
changetab_gmtime	Time of change (UTC)	PUBLIC, RONLY	time
changetab_id	ID of object for change. For inputs, outputs and watchdogs it is the index.	PUBLIC, RONLY	uint32
changetab_next_inputs	State of inputs after this event	PUBLIC, RONLY	uint32
changetab_next_outputs	State of outputs after this event	PUBLIC, RONLY	uint32
changetab_next_watchdogs	State of watchdogs after this event	PUBLIC, RONLY	uint32
changetab_objectname	Name of object for this change	PUBLIC, RONLY	char[]
changetab_prev_inputs	State of inputs before this event	PUBLIC, RONLY	uint32
changetab_prev_outputs	State of outputs before this event	PUBLIC, RONLY	uint32
changetab_prev_watchdogs	State of watchdogs before this event	PUBLIC, RONLY	uint32
changetab_time	Time of change (local time)	PUBLIC, RONLY	time
changetab_timestamp	Time stamp of change (UTC)	PUBLIC, RONLY	ts
changetab_type	Type of change: * 1: Input * 2: Output * 3: Watchdog	PUBLIC, RONLY	uint32
changetab_typedesc	Type of change as Text	PUBLIC, RONLY	char[]
changetab_user	Index of the user who made this change, or special values for changes without user	PUBLIC, RONLY	uint32
changetab_username	Name of the user who made this change, or special values for changes without user	PUBLIC, RONLY	char[]
changetab_value	New value after change	PUBLIC, RONLY	int32

filetab

Variable	Description	Flags	Format
filetab_date	Date on which the content file was uploaded	RONLY	date
filetab_is_default	Is this a default file	RONLY	bool
filetab_name	Name of content file	RONLY	char[]
filetab_path	Path of content file	RONLY	char[]
filetab_size	Size of content file in Bytes	RONLY	uint32
filetab_time	Time of last change to content file	RONLY	time

fwtab

Variable	Description	Flags	Format
fwtab_date	Date of creation of firmware	RONLY	date
fwtab_name	Name of firmware	RONLY	char[]
fwtab_system_version	Version of operating system of firmware	RONLY	char[]
fwtab_time	Time of creation of firmware	RONLY	time
fwtab_valid	Buffer contains valid firmware image	RONLY	bool
fwtab_version	Firmware version	RONLY	char[]

histotab

Variable	Description	Flags	Format
histotab_date	Date of measurement (local time)	PUBLIC, RONLY	date
histotab_flags	Status of sensor * Bit 0: First value after system start * Bit 1: Internal: Values are stored as difference * Bit 2: Internal: The set of sensors is unchanged * Bit 8: There is a database error (not stored)	PUBLIC, RONLY	uint16
histotab_gmdate	Date of measurement (UTC)	PUBLIC, RONLY	date
histotab_gmt_offset	Difference between local time and UTC in seconds, including summer time, if active	PUBLIC, RONLY	int32
histotab_gmtime	Time of measurement (UTC)	PUBLIC, RONLY	time
histotab_raw_content	Prints content of database entry directly. Useful for debugging, because e.g. also data for deleted sensors is visible.	PUBLIC, RONLY	char[]
histotab_time	Time of measurement (local time)	PUBLIC, RONLY	time
histotab_timestamp	Time stamp of measurement (UTC)	PUBLIC, RONLY	ts

inputtab

Variable	Description	Flags	Format
inputtab_activity	Number of seconds since last activity for this input or -1 for no activity since start	PUBLIC, RONLY	int32
inputtab_activity_text	Time since last activity for this input or "" for no activity since start	PUBLIC, RONLY	char[]
inputtab_flags	Bit flags for notifications		uint32
inputtab_group	Arbitrary text for grouping	PUBLIC	char[]
inputtab_min_change_dur	Minimal duration until an input change is recognized in steps of 0.1s		fixed
inputtab_name	Name of input	PUBLIC	char[]
inputtab_name_def	Name with default value if empty	PUBLIC, RONLY	char[]
inputtab_notification_html		RONLY
inputtab_remote0_flags	Bit flags for notifications		uint32
inputtab_remote0_notification_html		RONLY
inputtab_value	Current state of input	PUBLIC, RONLY	int32

logtab

Variable	Description	Flags	Format
logtab_date	Date of event	PUBLIC, RONLY	date
logtab_msg	Syslog notification	PUBLIC, RONLY	char[]
logtab_time	Time of event	PUBLIC, RONLY	time
logtab_timestamp	Time stamp of event	PUBLIC, RONLY	ts

netiftab

Variable	Description	Flags	Format
include_network_settings		RONLY
netiftab_cdns_ip	Configured static IP address of primary DNS server	NEEDS_REBOOT	ip4
netiftab_cdns_ip_sec	Configured static IP address of secondary DNS server	NEEDS_REBOOT	ip4
netiftab_cip_addr	Configured static IP address	NEEDS_REBOOT	ip4
netiftab_cip_gate	Configured static IP address of gateway	NEEDS_REBOOT	ip4
netiftab_cip_mask	Configured static subnet mask	NEEDS_REBOOT	ip4
netiftab_dhcp_state	DHCP state	RONLY	char[]
netiftab_dns_ip	Current IP address of primary DNS server	RONLY	ip4
netiftab_dns_ip_sec	Current IP address of secondary DNS server	RONLY	ip4
netiftab_dns_manu	Manual DNS IP address activated	NEEDS_REBOOT	bool
netiftab_flags	Bit flags for activations Bit 0: Discovery Bit 3: WiFi Bit 4: DHCP Bit 5: MDNS	NEEDS_REBOOT	uint32
netiftab_ip_addr	Current IP address	RONLY	ip4
netiftab_ip_gate	Gateway IP address	RONLY	ip4
netiftab_ip_manu	Manual IP configuration activated	NEEDS_REBOOT	bool
netiftab_ip_mask	IP network mask	RONLY	ip4
netiftab_mac	MAC address	PUBLIC, RONLY	char[]
netiftab_syslog	Syslog server hostname or IP address		char[]
netiftab_syslog_port	Port number of Syslog server		uint16
netiftab_type_name	Type of network interface, "WLAN" or "Ethernet"	RONLY	char[]
netiftab_up	Is network interface active	RONLY	bool

outputtab

Variable	Description	Flags	Format
outputtab_activity	Number of seconds since last activity for this output or -1 for no activity since start	PUBLIC, RONLY	int32
outputtab_activity_text	Time since last activity for this output or "" for no activity since start	PUBLIC, RONLY	char[]
outputtab_flags	Bit flags for notifications		uint32
outputtab_group	Arbitrary text for grouping	PUBLIC	char[]
outputtab_mqtt_subscribe	MQTT topic for control of this output		char[]
outputtab_name	Name of output	PUBLIC	char[]
outputtab_name_def	Name with default value if empty	PUBLIC, RONLY	char[]
outputtab_notification_html		RONLY
outputtab_pulse	Pulse length in seconds or 0, if no pulse should be used		fixed
outputtab_remote0_flags	Bit flags for notifications		uint32
outputtab_remote0_notification_html		RONLY
outputtab_value	Current state of output	PUBLIC, RONLY	int32

pushtab

Variable	Description	Flags	Format
pushtab_ena	HTTP Push enabled		bool
pushtab_rate	Update rate of HTTP Push in minutes		uint16
pushtab_tpl	Name of template file for HTTP Push service		char[]
pushtab_url	URL for HTTP Push service		char[]
pushtab_var1	First variable for HTTP Push service		char[]
pushtab_var2	Second variable for HTTP Push service		char[]

sensortab

Variable	Description	Flags	Format
sensortab_activity	Number of seconds since last activity for this sensor or -1 for no activity since start	PUBLIC, RONLY	int32
sensortab_activity_text	Time since last activity for this sensor or "" for no activity since start	PUBLIC, RONLY	char[]
sensortab_control_register
sensortab_cunit	Custom unit as text	PUBLIC	char[]
sensortab_firmware_info		RONLY
sensortab_firmware_info_updater		RONLY
sensortab_flags	Bit flags for notifications		uint32
sensortab_found_hardware	Sensor found with search	PUBLIC, RONLY	bool
sensortab_gain	Factor by which the measured sensor values are multiplied	PUBLIC	fixed
sensortab_group	Arbitrary text for grouping	PUBLIC	char[]
sensortab_hist_avg	Average value for this sensor in histotab entry	PUBLIC, RONLY	fixed
sensortab_hist_flags	Flags for this Sensor in histotab entry Same as sensortab_status with the addition of: * Bit 12: First entry for this sensor	PUBLIC, RONLY	uint32
sensortab_hist_hi	Maximal value for this sensor in histotab entry	PUBLIC, RONLY	fixed
sensortab_hist_lo	Minimal value for this sensor in histotab entry	PUBLIC, RONLY	fixed
sensortab_hyst	Hysteresis for sensor alerts	PUBLIC	fixed
sensortab_iunit	Unit of sensor as number	PUBLIC	uint32
sensortab_last_error	Last error code for sensor as hex string	PUBLIC, RONLY	char[]
sensortab_lim_hi	Sensor's upper alert threshold	PUBLIC	fixed
sensortab_lim_lo	Sensor's lower alert threshold	PUBLIC	fixed
sensortab_name	Name of sensor	PUBLIC	char[]
sensortab_name_def	Name with default value if empty	PUBLIC, RONLY	char[]
sensortab_notification_html		RONLY
sensortab_offset	Offset that is added to the measured sensor values	PUBLIC	fixed
sensortab_remote0_flags	Bit flags for notifications		uint32
sensortab_remote0_notification_html		RONLY
sensortab_serial	Serial number of sensor For 1-Wire the serial number has an additional index to distinguish multiple sensors of the same 1-Wire device	PUBLIC, RONLY	char[]
sensortab_serial_onewire	1-Wire serial number of sensor	PUBLIC	char[]
sensortab_status	Current sensor status * Bit 0: Lower limit alarm * Bit 1: Upper limit alarm * Bit 2: Falling limit alarm * Bit 3: Rising limit alarm * Bit 7: Sensor error	PUBLIC, RONLY	uint8
sensortab_status_text	sensortab_status as text	PUBLIC, RONLY	char[]
sensortab_unit	Unit of value as text with HTML entities. Always %RH for humidity and °C, °F or K for temperatures, depending on sensortab_iunit.	PUBLIC, RONLY	char[]
sensortab_unit_fract	Exponent of decimal fraction for display, also equals the number of decimal points	PUBLIC	int32
sensortab_unit_input		RONLY
sensortab_updater_active		PUBLIC
sensortab_value	Current value measured by sensor	PUBLIC, RONLY	fixed

watchtab

Variable	Description	Flags	Format
watchtab_activity	Number of seconds since last activity for this watchdog or -1 for no activity since start	PUBLIC, RONLY	int32
watchtab_activity_text	Time since last activity for this watchdog or "" for no activity since start	PUBLIC, RONLY	char[]
watchtab_flags	Bit flags for notifications		uint32
watchtab_group	Arbitrary text for grouping	PUBLIC	char[]
watchtab_name	Name of Watchdog	PUBLIC	char[]
watchtab_name_def	Name with default value if empty	PUBLIC, RONLY	char[]
watchtab_notification_html		RONLY
watchtab_rate	For passive watchdogs: Maximum duration, until the device has to report, before the watchdog triggers For active watchdogs: Duration, until it is checked again, if device is reachable		uint32
watchtab_remote0_flags	Bit flags for notifications		uint32
watchtab_remote0_notification_html		RONLY
watchtab_state	State of the watchdog: * -1: Unknown (After reboot or change of type) * 0: Good * 1: Triggered	PUBLIC, RONLY	int32
watchtab_target	For Ping-Out-Watchdog: IP/Hostname of device For HTTP-Out-Watchdogs: IP/Hostname of device For HTTP-In-Watchdogs: Name used in URL		char[]
watchtab_time_left	Duration until watchdog will be checked again or device has to report	PUBLIC, RONLY	uint32
watchtab_type	Type of Watchdog: * 1: Outgoing Ping * 2: Incoming Ping * 3: Outgoing HTTP request * 4: Incoming HTTP request	PUBLIC	uint32
watchtab_type_input		RONLY

Flag Reference

Flag	Meaning
HTTP_PUSH_CHANGED	HTTP Push Changed
MODBUS_CHANGED	Modbus Changed
MQTT_NEED_RECONNECT	MQTT Needs Reconnect
NEEDS_REBOOT	Needs Reboot
NTP_CHANGED	NTP Changed
PUBLIC	Public
RONLY	Read only
SENSOR_SETTINGS_CHANGED	Sensor Settings Changed
SNMP_SETTINGS_CHANGED	SNMP Settings Changed
SYSLOG_CHANGED	Syslog Changed
WATCHDOG_CHANGED	Watchdog Changed
WLAN_CLIENT_CHANGED	WLAN Client Changed

Format Reference

Format	Meaning
Dd Hh Mm Ss
bool
char[]
check
date
fixed
int
int32
ip4
time
ts
uin32
uint
uint16
uint32
uint8