From 3412bedb2a54485197c422b98de11e30b38906f1 Mon Sep 17 00:00:00 2001
From: Volodymyr Shymanskyy <vshymanskyi@gmail.com>
Date: Wed, 7 Dec 2016 16:03:10 +0200
Subject: [PATCH] Auto-detect baud rate

---
 tools/AT_Debug/AT_Debug.ino | 78 +++++++++++++++++++++++++------------
 1 file changed, 54 insertions(+), 24 deletions(-)

diff --git a/tools/AT_Debug/AT_Debug.ino b/tools/AT_Debug/AT_Debug.ino
index 2136807..d004ba5 100644
--- a/tools/AT_Debug/AT_Debug.ino
+++ b/tools/AT_Debug/AT_Debug.ino
@@ -1,47 +1,77 @@
 /**************************************************************
  *
- * To run this tool you need StreamDebugger library:
- *   https://github.com/vshymanskyy/StreamDebugger
- *   or from http://librarymanager/all#StreamDebugger
+ * This script tries to auto-detect the baud rate
+ * and allows direct AT commands access
  *
  * TinyGSM Getting Started guide:
  *   http://tiny.cc/tiny-gsm-readme
  *
  **************************************************************/
 
-#include <TinyGsmClient.h>
-#include <StreamDebugger.h>
-
-char apn[]  = "YourAPN";
-char user[] = "";
-char pass[] = "";
+// Set serial for debug console (to the Serial Monitor, speed 115200)
+#define SerialMonitor Serial
 
+// Set serial for AT commands (to the module)
 // Use Hardware Serial on Mega, Leonardo, Micro
-#define GsmSerial Serial1
+#define SerialAT Serial1
 
 // or Software Serial on Uno, Nano
-//#include <SoftwareSerial.h>
-//SoftwareSerial GsmSerial(2, 3); // RX, TX
+//#include <SoftwareSerialMonitor.h>
+//SoftwareSerial SerialAT(2, 3); // RX, TX
 
-StreamDebugger DebugSerial(GsmSerial, Serial);
-TinyGsmClient gsm(DebugSerial);
+#include <TinyGsmClient.h>
+TinyGsmClient gsm(SerialAT);
 
 void setup() {
   // Set console baud rate
-  Serial.begin(115200);
-  delay(10);
+  SerialMonitor.begin(115200);
+  delay(5000);
+}
 
-  // Set GSM module baud rate
-  GsmSerial.begin(115200);
-  delay(3000);
+void loop() {
+  // Detect module baud rate
+  uint32_t rate = 0;
+  uint32_t rates[] = { 115200, 9600, 57600, 19200, 74400, 74880 };
 
-  gsm.networkConnect(apn, user, pass);
+  SerialMonitor.println("Autodetecting baud rate");
+  for (unsigned i = 0; i < sizeof(rates)/sizeof(rates[0]); i++) {
+    SerialMonitor.print(String("Trying baud rate ") + rates[i] + "... ");
+    SerialAT.begin(rates[i]);
+    delay(10);
+    if (gsm.autoBaud(3000)) {
+      rate = rates[i];
+      SerialMonitor.println(F("OK"));
+      break;
+    } else {
+      SerialMonitor.println(F("fail"));
+    }
+  }
 
-  // Access AT commands from Serial
-  DebugSerial.directAccess();
-}
+  if (!rate) {
+    SerialMonitor.println(F("***********************************************************"));
+    SerialMonitor.println(F(" Module does not respond!"));
+    SerialMonitor.println(F("   Check your Serial wiring"));
+    SerialMonitor.println(F("   Check the module is correctly powered and turned on"));
+    SerialMonitor.println(F("***********************************************************"));
+    delay(30000L);
+    return;
+  }
 
-void loop() {
+  // Access AT commands from Serial Monitor
+  SerialMonitor.println(F("***********************************************************"));
+  SerialMonitor.println(F(" You can now send AT commands"));
+  SerialMonitor.println(F(" Enter \"AT\" (without quotes), and you should see \"OK\""));
+  SerialMonitor.println(F(" If it doesn't work, select \"Both NL & CR\" in Serial Monitor"));
+  SerialMonitor.println(F("***********************************************************"));
 
+  while(true) {
+    if (SerialAT.available()) {
+      SerialMonitor.write(SerialAT.read());
+    }
+    if (SerialMonitor.available()) {
+      SerialAT.write(SerialMonitor.read());
+    }
+    delay(0);
+  }
 }