From d1766604d9f2728dc3d0e9e54e063c89be8c923d Mon Sep 17 00:00:00 2001
From: Lee Lup Yuen <luppy@appkaki.com>
Date: Thu, 27 Apr 2023 14:49:04 +0800
Subject: [PATCH] Update doc

---
 README.md | 33 +++++++++++----------------------
 1 file changed, 11 insertions(+), 22 deletions(-)

diff --git a/README.md b/README.md
index 1183577..90a5761 100644
--- a/README.md
+++ b/README.md
@@ -7244,32 +7244,21 @@ Comes from the [Unicode UTF-16 Encoding](https://en.wikipedia.org/wiki/UTF-16) o
 
 _Why send SMS in PDU Mode instead of Text Mode?_
 
-- TODO: More reliable (304 Invalid PDU)
+Sending SMS Messages in Text Mode looks easier. But we should use PDU Mode instead. Here's why...
 
-- TODO: UTF-16 Encoding
+TODO PDU Mode works more reliably (304 Invalid PDU)
 
-- TODO: Receive messages
+```text
+// Text Mode: How many characters in this SMS?
+AT+CMGS="yourphonenumber"
+```
 
-  ```text
-  // Select Message Service 3GPP TS 23.040 and 3GPP TS 23.041
-  AT+CSMS=1
-  +CSMS: 1,1,1
-  OK
+TODO
 
-  // Set SMS Event Reporting Configuration
-  AT+CNMI=1,2,0,0,0
-  OK
-
-  // Message is dumped directly when an SMS is received
-  +CMT: "+8615021012496",,"13/03/18,17:07:21+32",145,4,0,0,"+8613800551500",145,28
-  This is a test from Quectel.
-
-  // Send ACK to the network
-  AT+CNMA
-  OK
-  ```
-
-  [(EG25-G AT Commands, Page 167)](https://wiki.pine64.org/wiki/File:Quectel_EC2x%26EG9x%26EG2x-G%26EM05_Series_AT_Commands_Manual_V2.0.pdf)
+```text
+// PDU Mode: 41 bytes in this SMS (excluding SMSC)
+AT+CMGS=41
+```
 
 # Compile NuttX on Android with Termux