Develop, update, and restart your ESP32 applications in less than two seconds

Related tags

Network esp32 toit
Overview

Jaguar

Develop, update, and restart your ESP32 applications in less than two seconds. Use the really fast development cycle to iterate quickly and learn fast!

What is it?

Jaguar is a small Toit program that runs on your ESP32. It uses the capabilities of the Toit virtual machine to let you update and restart your ESP32 applications written in Toit over WiFi. Change your Toit code in your editor, update the application on your device, and restart it all within seconds. No need to flash over serial, reboot your device, or wait for it to reconnect to your network.

Watch a short video that shows how you can experience Jaguar on your ESP32 in less than 3 minutes:

Jaguar demonstration

How does it work?

Jaguar runs a small HTTP server that listens for incoming requests. The requests contain compiled Toit applications that are relocated and installed in flash on the device. Before installing an application, we stop any old version of the application and free the resources it has consumed. The new version of the application gets to start again from main.

How do I use it?

First you'll need to have a Go development environment properly set up. Using that you can install the jag command line tool using go install:

go install github.com/toitlang/jaguar/cmd/jag@latest

Remember to add $HOME/go/bin or %USERPROFILE%\go\bin to your PATH. Next step is to let jag download and configure the Toit SDK and the associated tools for flashing the Jaguar application onto your ESP32:

jag setup

Now it is time to connect your ESP32 with a serial cable to your computer and put the Jaguar application onto it:

jag flash --port=/dev/ttyUSB0 --wifi-ssid="<ssid>" --wifi-password="<password>"

Now it is possible to monitor the serial output from the device:

jag monitor --port=/dev/ttyUSB0

Once the serial output shows that your ESP32 runs the Jaguar application, it will start announcing its presence to the network using UDP broadcast. You can find a device by scanning, but this requires you to be on the same local network as your ESP32:

jag scan

With the scanning complete, you're ready to run your first Toit program on your Jaguar-enabled ESP32 device:

jag run examples/hello.toit

Building it yourself

You've read this far and you want to know how to build Jaguar and the underlying Toit language implementation yourself? Great! You will need to follow the instructions for building Toit and make sure you can flash a simple example onto your device.

Let's assume your git clones can be referenced like this:

export TOIT_PATH=<path to https://github.com/toitlang/toit clone>
export JAGUAR_PATH=<path to https://github.com/toitlang/jaguar clone>

Now start with flashing the Jaguar application onto your ESP32. This is easily doable from within the $TOIT_PATH directory:

make flash ESP32_ENTRY=$JAGUAR_PATH/src/jaguar.toit \
  ESP32_PORT=/dev/ttyUSB0 \
  ESP32_WIFI_SSID="<ssid>" \
  ESP32_WIFI_PASSWORD="<password>"

For building Jaguar, all you need to do is run from within your $JAGUAR_PATH directory:

make

You can now run Jaguar by telling it where to find the Toit SDK and the snapshot for the Jaguar application for the ESP32:

export JAG_TOIT_PATH=$TOIT_PATH/build/host/sdk
export JAG_ENTRY_POINT=$TOIT_PATH/build/snapshot
build/jag scan

To also do the ESP32 flashing through Jaguar, you'll need two extra environment variables:

export JAG_ESP32_BIN_PATH=$TOIT_PATH/build/esp32
export JAG_ESPTOOL_PATH=$IDF_PATH/components/esptool_py/esptool/esptool.py
build/jag flash --port=/dev/ttyUSB0 --wifi-ssid="<ssid>" --wifi-password="<password>"

Contributing

We welcome and value your open source contributions to Jaguar (or Shaguar as we like to call it).

Shaguar!

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Comments
  • ESP32-C3 not support

    ESP32-C3 not support 

    % jag flash           
Flashing device over serial on port '/dev/cu.usbserial-2140' ...
esptool.py v3.0
Serial port /dev/cu.usbserial-2140
Connecting....
WARNING: This chip doesn't appear to be a ESP32 (chip magic value 0x1b31506f). Probably it is unsupported by this version of esptool.
Chip is ESP32-D0WDQ6 (revision 0)
Features: WiFi, BT, Dual Core, Coding Scheme None
WARNING: Detected crystal freq 0.00MHz is quite different to normalized freq 26MHz. Unsupported crystal in use?
Crystal is 26MHz
MAC: 00:00:00:00:00:00
Uploading stub...
Running stub...

A fatal error occurred: Invalid head of packet (0x47)
Error: exit status 2

    I could use this command to flash micropython framework: esptool.py --chip esp32-c3 --baud 460800 --port /dev/cu.usbserial-2140 write_flash -z 0x0

    How can I add those similar additional params to jag command line?

    opened by nne998 1
  • Reply to HTTP requests with error code on failures

    Reply to HTTP requests with error code on failures

    Today, Jaguar doesn't reply with an error to HTTP requests that fail in unexpected ways (exceptions, timeouts, etc.).

    We probably need to wrap the HTTP request handling in something that acts on exceptions. It isn't quite clear if the request should be considered handled if we sent the exception back to the user or if we should continue unwinding.

    https://github.com/toitlang/jaguar/blob/59aa0fcd6d1b3e671998878a72dbd55d50b6e8e8/src/jaguar.toit#L480

    enhancement good first issue 
    opened by kasperl 0
  • Default timeout for 'jag scan' with IP address is too low

    Default timeout for 'jag scan' with IP address is too low

    It seems pretty common that we cannot complete the HTTP /identify request in 600ms. Perhaps we need a higher default timeout when we're scanning specific addresses because it involves a HTTP roundtrip that isn't necessary when just listening for broadcasted UDP packets?

    good first issue 
    opened by kasperl 1
  • WiFi times out waiting for IP address from DHCP server

    WiFi times out waiting for IP address from DHCP server

    after successfull start and longer run, the toit firmware reports wifi reconnection errors:

    Restart Message: grafik

    Decoded Error: EXCEPTION error. DEADLINE_EXCEEDED 0: Monitor.await /core/monitor_impl.toit:28:20 1: ResourceState_.wait_for_state_ /core/events.toit:55:5 2: ResourceState_.wait. /core/events.toit:22:12 3: Monitor.locked_. /core/monitor_impl.toit:123:12 4: Monitor.locked_ /core/monitor_impl.toit:95:3 5: ResourceState_.wait /core/events.toit:21:3 6: WifiModule.wait_for_ip_address system/extensions/esp32/wifi.toit:208:25 7: WifiServiceDefinition.turn_on.. system/extensions/esp32/wifi.toit:67:47 8: Task_.with_deadline_. /core/task.toit:73:21 9: Task_.with_deadline_ /core/task.toit:67:3 10: with_timeout /core/utils.toit:179:15 11: with_timeout /core/utils.toit:162:12 12: WifiServiceDefinition.turn_on. system/extensions/esp32/wifi.toit:67:7 13: WifiServiceDefinition.turn_on system/extensions/esp32/wifi.toit:62:3 14: WifiState.up.. system/extensions/esp32/wifi.toit:102:31 15: WifiState.up. system/extensions/esp32/wifi.toit:98:3 16: Monitor.locked_. /core/monitor_impl.toit:123:12 17: Monitor.locked_ /core/monitor_impl.toit:95:3 18: WifiState.up system/extensions/esp32/wifi.toit:98:3 19: WifiServiceDefinition.connect system/extensions/esp32/wifi.toit:53:23 20: WifiServiceDefinition.connect system/extensions/esp32/wifi.toit:44:12 21: NetworkServiceDefinitionBase.handle system/extensions/shared/network_base.toit:26:14 22: WifiServiceDefinition.handle system/extensions/esp32/wifi.toit:41:12 23: ServiceManager_. /system/services.toit:332:15 24: RpcRequest_.process. /rpc/broker.toit:98:26 25: RpcRequest_.process /rpc/broker.toit:95:3 26: RpcRequestQueue_.ensure_processing_task_... /rpc/broker.toit:214:20 27: RpcRequestQueue_.ensure_processing_task_.. /rpc/broker.toit:209:9 28: RpcRequestQueue_.ensure_processing_task_. /rpc/broker.toit:204:81

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Releases(v1.7.14)
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