docs: clarify CM3000 login behavior

Author: itsDNNS

README.md

@@ -168,7 +168,7 @@ Open `http://localhost:8765` — no setup required.
 | **Arris Touchstone CM8200A** | ✅ Fully supported | ISP-branded DOCSIS 3.1 |
 | **AVM Fritz!Box Cable** (6490, 6590, 6591, 6660, 6690) | ✅ Fully supported | |
 | **Hitron CODA-56** | ✅ Fully supported | DOCSIS 3.1 |
-| **Netgear CM3000** | ✅ Fully supported | DOCSIS 3.1 standalone |
+| **Netgear CM3000** | ✅ Fully supported | DOCSIS 3.1 standalone, JS parsing, `Login.htm` fallback |
 | **Sagemcom F@st 3896** | ✅ Fully supported | JSON-RPC API |
 | **Unitymedia Connect Box** (CH7465) | ✅ Fully supported | |
 | **Vodafone Station** (CGA4233, TG3442DE) | ✅ Fully supported | Bridge mode compatible |

app/drivers/cm3000.py

@@ -11,7 +11,8 @@
 - InitUsOfdmaTableTagValue() -- US OFDMA  (2 channels, 6 fields each)
 - InitTagValue()             -- system/device info
 
-Auth is HTTP Basic Auth (standard for Netgear Nighthawk modems).
+Authentication starts with direct status page access and falls back to the
+web login form on firmware that redirects through Login.htm first.
 """
 
 import logging
@@ -60,7 +61,8 @@
 class CM3000Driver(ModemDriver):
     """Driver for Netgear CM3000 DOCSIS 3.1 cable modem.
 
-    Authentication uses HTTP Basic Auth (IP-based session).
+    Authentication uses direct DocsisStatus access with a Login.htm form
+    fallback on newer firmware variants.
     DOCSIS data is extracted from JavaScript variables on /DocsisStatus.htm.
     """