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# Basic API information
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Tasmota can easily be extended by developers using provided function pointers as callback Ids. This document lists the available callback function Ids. See the wiki (https://github.com/arendst/Tasmota/wiki/Sensor-API) for more information.
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Callback availability can be checked by searching for either XdrvCall, XsnsCall, XdspCall, XnrgCall and XlgtCall.
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## Driver, Sensor, Energy and Light Callback Ids
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The following table lists Callback Ids and their availability for a Driver, Sensor or Energy service.
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Callback Id | Bool | xdrv | xsns | xnrg | xlgt | Description
----------------------------|------|------|------|------|------|----------------------------------
FUNC_SETTINGS_OVERRIDE | | x | | | | Override start-up settings
FUNC_PIN_STATE | x | 1 | 2 | | | At GPIO configuration
FUNC_MODULE_INIT | x | 1 | | | 2 | Init module specific parameters
FUNC_PRE_INIT | | 1 | | 2 | | Once GPIO have been established
FUNC_INIT | | 1 | 3 | 2 | | At end of initialisation
FUNC_LOOP | | 1 | 2 | | | In main loop
FUNC_EVERY_50_MSECOND | | 1 | 2 | | |
FUNC_EVERY_100_MSECOND | | 1 | 2 | | |
FUNC_EVERY_200_MSECOND | | | | x | |
FUNC_EVERY_250_MSECOND | | 1 | 3 | 2 | |
FUNC_EVERY_SECOND | | 1 | 2 | | |
FUNC_SAVE_AT_MIDNIGHT | | | x | | | At midnight
FUNC_SAVE_BEFORE_RESTART | | 2 | 1 | | | Just before a planned restart
FUNC_AFTER_TELEPERIOD | | x | | | | At end of teleperiod
FUNC_JSON_APPEND | | 2 | 1 | 3 | | Extend teleperiod JSON text
FUNC_WEB_SENSOR | | 2 | 1 | 3 | | Add sensor data to web GUI
FUNC_COMMAND | x | 1 | 2 | 3 | 4 | When a command is not recognized
FUNC_COMMAND_DRIVER | x | x | | | | When command Driver\<id\> is executed
FUNC_COMMAND_SENSOR | x | | x | | | When command Sensor\<id\> is executed
FUNC_MQTT_SUBSCRIBE | | x | | | | At end of MQTT subscriptions
FUNC_MQTT_INIT | | x | | | | Once at end of MQTT connection
FUNC_MQTT_DATA | x | x | | | | Before decoding command
FUNC_SET_POWER | | x | | | | Before setting relays
FUNC_SET_DEVICE_POWER | x | x | | | | Set relay
FUNC_SHOW_SENSOR | | x | | | | When FUNC_JSON_APPEND completes
FUNC_ANY_KEY | | x | | | |
FUNC_ENERGY_EVERY_SECOND | | | | x | |
FUNC_ENERGY_RESET | | | | x | |
FUNC_RULES_PROCESS | x | x | | | | Process specific rule
FUNC_SERIAL | x | 1 | | 2 | 3 | Process serial data
FUNC_FREE_MEM | | x | | | | Show free memory for debugging
FUNC_BUTTON_PRESSED | x | x | | | | When a button is pressed
FUNC_WEB_ADD_BUTTON | | 1 | 2 | | | Add a Configuration Button to GUI
FUNC_WEB_ADD_MAIN_BUTTON | | 1 | 2 | | | Add a main button to GUI
FUNC_WEB_ADD_HANDLER | | 1 | 2 | | | Add a webserver handler
FUNC_SET_CHANNELS | | 2 | | | 1 |
FUNC_SET_SCHEME | | | | | x |
The numbers represent the sequence of execution
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## Display Call back Ids
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The following table lists all Callback Ids for a Display service.
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Callback Id | Bool | Description
------------------------------|------|---------------------
FUNC_DISPLAY_INIT_DRIVER | |
FUNC_DISPLAY_INIT | |
FUNC_DISPLAY_EVERY_50_MSECOND | |
FUNC_DISPLAY_EVERY_SECOND | |
FUNC_DISPLAY_MODEL | x |
FUNC_DISPLAY_MODE | |
FUNC_DISPLAY_POWER | |
FUNC_DISPLAY_CLEAR | |
FUNC_DISPLAY_DRAW_FRAME | |
FUNC_DISPLAY_DRAW_HLINE | |
FUNC_DISPLAY_DRAW_VLINE | |
FUNC_DISPLAY_DRAW_LINE | |
FUNC_DISPLAY_DRAW_CIRCLE | |
FUNC_DISPLAY_FILL_CIRCLE | |
FUNC_DISPLAY_DRAW_RECTANGLE | |
FUNC_DISPLAY_FILL_RECTANGLE | |
FUNC_DISPLAY_TEXT_SIZE | |
FUNC_DISPLAY_FONT_SIZE | |
FUNC_DISPLAY_ROTATION | |
FUNC_DISPLAY_DRAW_STRING | |
FUNC_DISPLAY_ONOFF | |
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## Init sequence
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The following list shows a typical callback init sequence
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```
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CFG: Loaded from flash at FB, Count 1581
xdrv - FUNC_SETTINGS_OVERRIDE
xdrv - FUNC_PIN_STATE
xsns - FUNC_PIN_STATE
xdrv - FUNC_MODULE_INIT
xlgt - FUNC_MODULE_INIT
xdrv - FUNC_PRE_INIT
xnrg - FUNC_PRE_INIT
SRC: Restart
xdrv - FUNC_SET_POWER
xlgt - FUNC_SET_CHANNELS
xdrv - FUNC_SET_DEVICE_POWER
Project tasmota Wemos 2 Version 7.0.0.3(tasmota)-STAGE
xdrv - FUNC_INIT
xsns - FUNC_INIT
I2C: ADS1115 found at 0x48
xdrv - FUNC_LOOP
xsns - FUNC_LOOP
xdrv - FUNC_EVERY_50_MSECOND
xlgt - FUNC_SET_CHANNELS
xsns - FUNC_EVERY_50_MSECOND
xdrv - FUNC_EVERY_100_MSECOND
xsns - FUNC_EVERY_100_MSECOND
xdrv - FUNC_EVERY_250_MSECOND
xsns - FUNC_EVERY_250_MSECOND
xdrv - FUNC_EVERY_SECOND
xsns - FUNC_EVERY_SECOND
WIF: Attempting connection...
WIF: Network (re)scan started...
WIF: Attempting connection...
WIF: Attempting connection...
WIF: Attempting connection...
WIF: Network 0, AP1, SSId indebuurt1, Channel 1, BSSId 24:D3:F2:97:C0:A1, RSSI -86, Encryption 1
WIF: Network 1, AP2, SSId indebuurt2, Channel 5, BSSId A0:AB:1B:7D:42:AC, RSSI -42, Encryption 1
WIF: Network 2, AP-, SSId indebuurt3, Channel 12, BSSId 60:E3:27:58:77:E6, RSSI -84, Encryption 1
WIF: Connecting to AP2 indebuurt2 in mode 11N as wemos2...
WIF: Attempting connection...
WIF: Attempting connection...
WIF: Attempting connection...
WIF: Connected
xdrv - FUNC_WEB_ADD_HANDLER
xsns - FUNC_WEB_ADD_HANDLER
HTP: Web server active on wemos2 with IP address 192.168.2.191
NTP: Drift 0, (UTC) Wed Nov 06 13:57:08 2019, (DST) Sun Mar 31 02:00:00 2019, (STD) Sun Oct 27 03:00:00 2019
APP: Boot Count 500
MQT: Attempting connection...
MQT: Connected
MQT: tele/wemos2/LWT = Online (retained)
MQT: cmnd/wemos2/POWER =
MQT: Subscribe to cmnd/wemos2/#
MQT: Subscribe to cmnd/sonoffs/#
MQT: Subscribe to cmnd/DVES_15568C_fb/#
xdrv - FUNC_MQTT_SUBSCRIBE
MQT: tele/wemos2/INFO1 = {"Module":"Generic","Version":"7.0.0.3(tasmota)","FallbackTopic":"cmnd/DVES_15568C_fb/","GroupTopic":"cmnd/sonoffs/"}
MQT: tele/wemos2/INFO2 = {"WebServerMode":"Admin","Hostname":"wemos2","IPAddress":"192.168.2.191"}
MQT: tele/wemos2/INFO3 = {"RestartReason":"Software/System restart"}
MQT: stat/wemos2/RESULT = {"POWER1":"OFF"}
MQT: stat/wemos2/POWER1 = OFF
MQT: stat/wemos2/RESULT = {"POWER2":"ON"}
MQT: stat/wemos2/POWER2 = ON
xdrv - FUNC_MQTT_INIT
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CFG: Saved to flash at FA, Count 1582, Bytes 4096
```
