Arduino Hardware Serial Port5/5/2021
This had a lot of information about rationale and design considerations.Nordics protocol seems to be the most popular and seems to have the best software support.
This library exposes a Serial -like interface, but without any of the blocking calls (e.g., Serial.readBytesUntil ), and supports additional line-oriented features such as peekLine and readLine. Check out Using CommandParser to make a BLE commandline-like interface in the examples section. Serial has something similar with Serial.readBytesUntil, but it is harder to use and also blocks control flow. In the BLE connection, the phonecomputer is then the BLE central device. For iOS devices, heres my review of various available options. Scans quickly, connects quickly, and console is decently easy to use. However, it doesnt support setting up dedicated buttons that send common commands. Does support dedicated buttons for quick access to common commands, which is nice. However, it doesnt support UART that well, though in theory you can directly edit the RXTX characteristics to interface with UART. Usually, you would want ArduinoBLE to increase the MTU, to allow the board to receive messages up to 512 bytes in size. However, since ArduinoBLE doesnt allow increasing the MTU (even the internal ATTClass::setMaxMtu method doesnt seem to do anything), the other standard way to send longer messages is to send them in chunks with a short delay in between. As a workaround, I manually send long messages in chunks of 20 bytes within Bluefruit LE Connect. Afterwards, you must also tell ArduinoBLE to start actually broadcasting, using BLE.advertise(). For a helper function that does everything ArduinoBLE-related for you, see HardwareBLESerial::beginAndSetupBLE. Must be called regularly to ensure BLE state is kept up to date. Usually for UART terminals such as Bluefruit LE Connect, each time you press Send, it sends one data packet, and since you likely wont be sending messages more than twice a second, calling HardwareBLESerial::poll twice a second should be enough to ensure we dont miss anything. ![]() If no bytes are available for reading, then returns -1 instead. If no next line is available for reading, it simply null-terminates buffer so it contains an empty string. If there was no next line, then consider that as 0 characters being copied. Arduino Hardware Serial Port Code Example BelowThis works even without calling HardwareBLESerial::poll, so you can call this in a loop by itself without HardwareBLESerial::poll like in the code example below.
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