Toit is revolutionizing IoT development, making developing, installing and updating apps and/or the underlying firmware on embedded devices as simple and efficient as it is now on smartphones. Toit enables continuous firmware delivery and safely transports your data to the cloud, even when your device is on a shaky connection. And Toit is so efficient that your device can run on batteries, allowing you to deploy IoT in remote locations unreachable before.
The Toit virtual machine runs programs written in the Toit language. It has been designed to address common pain points in embedded systems.
Indeed, real-time operating systems for constrained devices do not shield individual applications from each other. Instead, they require all applications and the base operating system to be compiled, linked and deployed together, which makes updating them error-prone.
The Toit virtual machine augments the real-time operating system and isolates applications from the underlying hardware providing a robust, resilient, and flexible platform for running software. With the virtual machine, applications are developed, deployed, and updated separately; apps run side-by-side on the devices in their own sandboxed environment.
To see it for yourself, watch how Toit allows you to deploy, update and uninstall three apps, including one that would crash any other IoT device, on an ESP32 microcontroller.
And who could be better suited to do that than the five founders of Toit? These are the guys from the V8 team that turned your browser into an application platform with Google Chrome, and led the Dart project at Google, a cross-platform client-side language that became the foundation for Flutter, a fast-growing language for mobile apps.
Toit runs on the ESP32 chip from Espressif. We chose the ESP32 because it offers the best price/performance out of all the MCUs out there. For $2 or less you get 520 KB RAM, built-in WiFi, and 34 pins for peripherals configurable to be used for e.g. communication protocols (SPI, I2C), analog/digital interfacing (ADC/DAC), Ethernet, and much more. In addition, its deep-sleep mode allows for extremely low power usage and you can run on a couple of AA batteries for years. All this at a price that is a fraction of that for comparable or even inferior chips.
Because of the resource constraints on embedded microchips, an IoT computing platform needs to be tight in order to work.
Previous IoT languages (such as Java SE Embedded and MicroPython) were generated as a limited version of the corresponding standard language by removing classes and other tools. But at Toit, we wanted to create a high-level language that would avoid the limitations of the existing languages used in IoT development. On top of this, the Toit language had to be intuitive to learn and safe to use. Toit syntax is similar to Python, but compared to MicroPython, Toit’s execution is 20x faster.
With Toit, you use only one language for all logic on your devices, whether it is the driver for a sensor, or the applications running on the device.
C is a low-level language that allows full access to the system. It's a great language for operations that require precise memory layouts or interact a lot with system calls. In fact, we use it, and C++, under the hood.
However, C is harder to program in and requires the developer to focus on things that a high-level language, like Toit, can take care of. For instance, Toit comes with a garbage collector which makes dealing with memory much easier. Not only that, but automatic memory management also avoids many crashes that would bring down the full system. Toit programs are sandboxed and can't write to arbitrary memory locations.
Also, Toit is a much younger language and has incorporated lots of the language lessons that were learned in the meantime. It features classes, interfaces, named arguments, etc.
Finally, the Toit language comes with high-level libraries that abstract away the low-level operations. We, the Toit developers, fiddle with C, so that you don't need to.
MicroPython is a stripped-down version of Python that was not tailor-made for IoT. It is high-level, but it does not really behave as Python does, so that the switch from Python to MicroPython requires adjustments similar to the ones needed to switch from Python to Toit.
Since Python wasn't designed for embedded systems, it doesn't perform as well in that task either. Toit programs run typically 20x faster than MicroPython programs. Furthermore, the memory layout of objects in MicroPython is not as efficient as the one in Toit, which means that bigger programs (with many heap objects) are handled better by Toit than by MicroPython.
The Toit VM - Our Virtual Machine completely isolates you from the underlying microcontroller and peripherals, and lets you focus on building your solution, not battling hardware.
Robust sandboxing - You can update your apps as much as you want without affecting the other apps already installed on your devices
The Toit Language - Work in a modern, high-level language with all the perks that come with it, but with an execution speed that is an order of magnitude faster than MicroPython.
Over-The-Air updates - It does not matter if your device connections are slow or intermittent: Don't worry; your code and updates will come through.
The Toit API - Our API is your gateway to your devices and your data. You do not spend time setting up and keep the infrastructure running. Just plug into our API and start pulling your device data.
In short, with Toit, you do not need to worry about bugs; they can easily be fixed remotely, run-time. Don't worry about sketchy connectivity either: your updates will get there as soon as the device goes online.
All the functionality of the Toit console is available using the CLI or the APIs directly, so you never have to use our console if you do not like it. But even more, our API is available for you to develop your own fleet management UI, or to integrate Toit functionality with an existing third-party platform.
The Toit platform is built so that our cloud is essential for firmware updates, apps deployment. It is also used to collect data, logs and metrics. This tight integration between cloud and devices allows for maximal optimization - and ultimately drives down the amount of data sent between both entities.
In addition, we ensure your data is encrypted and safe both while stored on the device and while in transmission. The Toit platform is built fault-tolerant and handles both sketchy connections with low data rates, as well as devices that are set to be offline most of the time to preserve power. Thanks to this approach, you can interact with your devices even if they are temporarily offline.
And you can of course always redirect your data to another backend, but we are confident that using our cloud offers so many benefits in terms of security and ease of use that you will want to work with the Toit cloud.
Our platform is optimized to transfer as little data as possible, the amount of data can be customized to your needs, and we offer maximum transparency regarding the type of data that was used.
Optimization: Over-the-air firmware updates are based on checking the differences between the firmware version installed on the device, and the one you want to update to, so that we send as little data as possible to the device. You also remain in control of firmware updates, as you can always decide if and when you want to update.
Customization: Logs and metrics generated by a device can be easily adjusted to the threshold you need: you can for example choose to get all possible logs for a device in development, and opt to receive only critical logs from the devices in production. With a single CLI command, you can scale down the data generated by your entire fleet.
Transparency: Our cloud offers visualization of the data consumed from the organization level to the device level, so you can easily recognize Application data from System data, and identify devices that are producing the most data. The Data Usage tab of our console includes graphs that detail your day-to-day consumption, as well as the forecast expenses for the coming month.
Finally, our device software allows you to send your data directly to your own backend so that it never reaches our cloud. You only depend on us for the deployment of applications and firmware updates.
The ESP32 and Toit offer out-of-the-box WiFi connectivity. It is also possible to add Cellular connectivity with the operator of your choice, so you are flexible to choose the best provider for your communications needs.