pysamsung-dplug

Async Python client for old Samsung air conditioners that speak the legacy DPLUG / AC14K protocol over TLS on port 2878 (Wi-Fi modules such as SWL-B70F, used by the AR**HSFS generation, ~2013–2015).

These units were dropped by SmartThings. This library lets you control them locally again — no cloud. It is the protocol layer used by the samsung_ac_dplug Home Assistant integration, but works standalone.

Features

• Mutual-TLS handshake with the bundled Samsung client certificate (legacy TLS 1.0 / weak ciphers handled for you).
• Token acquisition (GetToken), authentication (AuthToken).
• Read full device state (DeviceState) and send commands (DeviceControl).
• Auto-discover the device id (DeviceList) and a passive async_probe().
• Live push updates with auto-reconnect (SamsungAcStream), alongside the short-lived-connection SamsungAcClient.
• On-device scheduling: read, create/edit and delete the unit's built-in schedules, with local↔UTC time conversion.
• Capability decoding from AC_ADD2_OPTIONCODE (OptionCode), the device clock, firmware versions, and Wi-Fi provisioning for AP-mode onboarding.

Install

pip install pysamsung-dplug

Usage

import asyncio
from samsung_dplug import SamsungAcClient, build_ssl_context

async def main():
    ctx = build_ssl_context()                      # uses the bundled certificate
    client = SamsungAcClient("192.168.1.53", token="xxxxxxxx-....", ssl_context=ctx)
    state = await client.async_get_state()
    print("Power:", state["AC_FUN_POWER"], "Room:", state["AC_FUN_TEMPNOW"])
    await client.async_set("AC_FUN_POWER", "On")

asyncio.run(main())

Getting a token

The unit only issues a token at power-on (a physical proof-of-access step):

client = SamsungAcClient("192.168.1.53", ssl_context=ctx)
# turn the unit OFF, call this, then turn it ON within ~30 s:
token = await client.async_get_token()

build_ssl_context() does blocking file I/O; inside async frameworks run it in an executor (e.g. Home Assistant: await hass.async_add_executor_job(build_ssl_context)).

On-device schedules

The unit has a built-in scheduler that runs off its own clock, even with nothing connected. Times are stored in UTC; pass your local tzinfo and the library converts both ways.

from zoneinfo import ZoneInfo
from samsung_dplug import Schedule, EVERYWEEK, weekdays_to_mask

tz = ZoneInfo("Europe/Rome")
await client.async_get_schedules(tz=tz)            # -> list[Schedule] (local time)
await client.async_set_schedule(                   # turn on at 07:00 on weekdays
    Schedule(hour=7, minute=0, repeat=EVERYWEEK,
             days=weekdays_to_mask(range(5)),       # Mon–Fri
             attrs={"AC_FUN_POWER": "On"}),
    tz=tz,
)
await client.async_delete_schedule("0")

Protocol documentation

Reverse-engineered from the official Smart Air Conditioner app and live devices. The unit greets with DPLUG-1.x, requires mutual TLS, and uses an XML request/response protocol over port 2878; the DUID equals the Wi-Fi module MAC without separators.

The full, structured write-up lives in docs/ — transport & TLS, connection lifecycle & auth, state & control, scheduling, the other commands, capability decoding, WiFi provisioning, and the reverse-engineering notes behind it all.

License

MIT