From 1e88d595386f555eea1db6f00cd6831f533737f2 Mon Sep 17 00:00:00 2001
From: Arslaan Pathan <arslaan@arslaancodes.com>
Date: Sun, 29 Mar 2026 18:26:19 +1300
Subject: feat: sendMessageByZk

---
 README.md | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

(limited to 'README.md')

diff --git a/README.md b/README.md
index 931bc06..4a1a8f7 100644
--- a/README.md
+++ b/README.md
@@ -84,6 +84,57 @@ Heart rate possible responses:
 
 Other responses (blood oxygen, blood pressure, blood sugar) have not been tested yet.
 
+### sendMessageByZk (push notification to watch)
+
+Must send `configDeviceSettings` first to enable notifications on the watch, otherwise messages will not display.
+
+Notification enable packet (write/6E40FC20)
+```
+byte[0]  = 0x02 (command)
+byte[1]  = 0x02 (subcommand)
+byte[2]  = skype enabled (0/1)
+byte[3]  = line enabled (0/1)
+byte[4]  = long time sit reminder interval
+byte[5]  = long time sit enabled (0/1)
+byte[6]  = call notice enabled (0/1)
+byte[7]  = SMS notice enabled (0/1)
+byte[8]  = WeChat enabled (0/1)
+byte[9]  = QQ enabled (0/1)
+byte[10] = KakaoTalk enabled (0/1)
+byte[11] = Facebook enabled (0/1)
+byte[12] = Twitter enabled (0/1)
+byte[13] = WhatsApp enabled (0/1)
+byte[14] = LinkedIn enabled (0/1)
+byte[15] = heart rate monitor (0/1)
+byte[16] = hands up screen on (0/1)
+byte[17] = heart rate loop monitor (0/1)
+byte[18] = heart rate monitor interval time
+byte[19] = Instagram enabled (0/1)
+byte[20] = other push enabled (0/1)
+byte[21] = Zalo (bit 0) + Messenger (bit 1) flags
+```
+
+Message packet structure (write/6E40FC20), one packet per 17 byte chunk:
+```
+byte[0]    = 0x23 (command)
+byte[1]    = chunk index (0, 1, 2...)
+byte[2]    = notification type
+             0x01 = SMS
+             0x02 = WeChat
+             0x03 = QQ
+             0x04 = DingTalk
+             0x05 = WhatsApp
+             0x06 = Facebook
+             0x07 = Twitter
+             0x08 = LinkedIn
+byte[3-19] = up to 17 bytes of UTF-8 message text
+byte[20]   = 0xFF end marker (last chunk only, appended after text)
+```
+
+Message format: `"Title: Content"`, title truncated to 23 bytes, content to 240 bytes.
+
+Send chunks sequentially with ~100ms delay between each.
+
 ### enterMakeDial (watch face)
 
 Watch face header packet (write/6E40FC20)  
-- 
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