NINA B112

The Nina B112 model mimicks basic functions of a real Ublox Nina B112 SPP (Serial Peripheral Profile).

The real device is used to act as a UART bridge over Bluetooth.

Current model supports only a minimal subset of all AT commands. It does not support extended data mode (EDM).

When in data mode it acts as a loopback. Once a number of bytes were received, it sends everything back.

It supports RTS generation. When enabled, the model generates RTS for a specific duration on two conditions:

once a number of words have been received,
randomly using a uniform random number generator. It generates a number between 0 and a high limit. If the generated number is below a threshold it triggers a RTS.

Serial parameters

Parameter	Supported values
Baudrate	19200 38400 57600 115200 (default) 230400 460800 1000000
Data bits	8 (default)
Stop bits	1 (default)
Parity	none (default) even
Flow control	enabled (default) disabled

AT commands

By default, if a command is not supported, model will respond ERROR. If command arguments are invalid, it will also respond with an error.

Note: AT is omitted.

Command	Support	Comments
(empty)	Complete
`E`	Partial	No effect
`+UFACTORY`	Partial	No effect
`O`	Partial	Extended Data Mode not supported
`+UBTUB=`	Partial	No effect
`+UBTLE=`	Partial	No effect
`+UBTLN=`	Partial	Notes: Command is accepted. Local name is not saved/checked.
`+UBTLN?`	Complete	Returns local name
`+UMRS=`	Complete	Change serial parameters: immediately for RX, when send queue has been emptied for TX.
`+UMRS?`	Complete	Returns serial parameters

JSON Configuration

Here are all the parameters that can be configured:

{
    "behavior": {
        "loopback_size": 200
    },
    "rts": {
        "enabled" : true,
        "buffer_limit": 200,
        "duration": 200,
        "random_seed": 12345,
        "random_high": 10000,
        "random_threshold": 100
    }
}

behavior controls how the model reacts:

loopback_size is the number of words that need to be received in data mode before sending it back.

rts controls the RTS generation of the model:

enabled: whether RTS generation is enabeled or not.
buffer_limit: once this number of words have been received received, it triggers a RTS.
duration: duration of the RTS in number of UART cycles.
random_seed: seed used by the random generator for the random RTS generation.
random_high: high limit of the random number generator.
random_threshold: threshold below which the random generated number will trigger a RTS.