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Angaza Nexus backend libraries for managing PAYG devices

Project description

Nexus Python

This repository contains server-side code for managing devices using Nexus protocols, including Nexus Keycode.

Learn more about about Angaza Nexus here!


Nexus Keycode will be available on PyPI. Installation will be as simple as:

pip install nexus-keycode

This package comes with a full suite of unit tests, which you can run like so:



Package Version

This package uses a form of semantic versioning. The version number is comprised of three components: MAJOR.MINOR.PATCH

Major version numbers represent breaking internal API changes. You may need to modify your code to accomodate these changes. Minor version numbers represent feature additions or changes that do not break the library's API, and are fully backward compatible. Patch version numbers represent bug fixes or minor changes that do not add additional functionality.

The package version is independent of the Nexus System Version that the package supports.


Generate keycodes for the full and small keypad protocols.

Full Protocol

Add Credit

secret_key = b"\xde\xad\xbe\xef" * 4
message = FullMessage.add_credit(
    id_=42, hours=24 * 7, secret_key=secret_key
# outputs *599 791 493 194 43#

Set Credit

message = FullMessage.set_credit(
    id_=43, hours=24 * 10, secret_key=secret_key
# outputs *682 070 357 093 12#


message = FullMessage.unlock(id_=44, secret_key=secret_key).to_keycode()
# outputs *578 396 697 305 45#


message = FullMessage.wipe_state(
    id_=45, flags=FullMessageWipeFlags.WIPE_IDS_ALL, secret_key=secret_key
# outputs *356 107 776 307 38#

Enabled/Disabled Test

message = FactoryFullMessage.oqc_test().to_keycode()
# outputs *577 043 3#

Factory Test

message = FactoryFullMessage.allow_test().to_keycode()
# outputs *406 498 3#

Display PAYG ID

message = FactoryFullMessage.display_payg_id().to_keycode()
# outputs *634 776 5#

Nexus Channel Origin Commands

These commands are accepted by Nexus Channel "Controller" devices using the "Full Protocol". Typically, these are used to manage the secured link state of "Controller" and "Accessory" devices.

See also: protocols/

Create Nexus Channel Secured Link

from nexus_keycode.protocols.full import FactoryFullMessage
from nexus_keycode.protocols.channel_origin_commands import ChannelOriginAction

message = FactoryFullMessage.passthrough_channel_origin_command(
    accessory_sym_key=b"\xAB" * 16,
    controller_sym_key=b"\xCD" * 16,
# outputs *817 307 500 565 772#

Delete Nexus Channel Secured Link (All Accessory Links)

from nexus_keycode.protocols.full import FactoryFullMessage
from nexus_keycode.protocols.channel_origin_commands import ChannelOriginAction

message = FactoryFullMessage.passthrough_channel_origin_command(
    controller_sym_key=b"\xCD" * 16,

# outputs *810 023 592 81#

Small Protocol

Add Credit

SECRET_KEY = b"\xde\xad\xbe\xef" * 4
AddCreditSmallMessage(id_=42, days=7, secret_key=secret_key).to_keycode()
# outputs 135 242 422 455 244

Set Credit

SetCreditSmallMessage(id_=44, days=10, secret_key=secret_key).to_keycode()
# outputs 142 522 332 234 533


UnlockSmallMessage(id_=45, secret_key=secret_key).to_keycode()
# outputs 152 323 254 454 322

Wipe Message IDs

MaintenanceSmallMessage(type_=MaintenanceSmallMessageType.WIPE_IDS_ALL, secret_key=secret_key).to_keycode()
# outputs 122 324 235 545 545

Wipe Custom "Restricted Flag"

CustomCommandSmallMessage(id_=46, type_=CustomCommandSmallMessageType.WIPE_RESTRICTED_FLAG, secret_key=secret_key).to_keycode()
# outputs 154 545 254 542 523

Set Credit + Wipe Custom "Restricted Flag"

# Creating a message of this type *may* lead to a 'message ID collision',
# meaning the message cannot be unambiguously interpreted by the unit
# (it might be mistaken for a different message if entered into the unit).
# If this occurs, an `ExtendedSmallMessageIdInvalidError` error will be raised.
# Typically incrementing the ID by 1 and creating the message again will
# succeed.

In [25]: ExtendedSmallMessage(id_=50, days=84, type_=ExtendedSmallMessageType.SET_CREDIT_WIPE_RESTRICTED_FLAG, secret_key=secret_key).to_keycode()
# raises `ExtendedSmallMessageIdInvalidError: ID 50 yields MAC collision, next valid ID is 51.`

In [26]: ExtendedSmallMessage(id_=51, days=84, type_=ExtendedSmallMessageType.SET_CREDIT_WIPE_RESTRICTED_FLAG, secret_key=secret_key).to_keycode()
# outputs 145 545 244 442 435

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