[SIM800] Fixed begin method

examples/SIM800/SIM800_SMS_Send/SIM800_SMS_Send.ino

@@ -5,8 +5,14 @@
 // include the library
 #include <RadioLib.h>
 
-// SIM800 module is in slot A on the shield
-SIM800 gsm = RadioShield.ModuleA;
+// SIM800 has the following connections:
+// TX pin: 9
+// RX pin: 8
+SIM800 gsm = new Module(9, 8);
+
+// or using RadioShield
+// https://github.com/jgromes/RadioShield
+//SIM800 gsm = RadioShield.ModuleA;
 
 void setup() {
   Serial.begin(9600);
@@ -14,7 +20,6 @@ void setup() {
   // initialize SIM800 with default settings
   Serial.print(F("[SIM800] Initializing ... "));
   // baudrate:  9600 baud
-  // PIN:       "1234"
   int state = gsm.begin(9600);
   if (state == ERR_NONE) {
     Serial.println(F("success!"));
@@ -28,7 +33,7 @@ void setup() {
 void loop() {
   // send SMS to number 0123456789
   Serial.print(F("[SIM800] Sending SMS ... "));
-  int state = gsm.sendSMS("0123456789", "Hello World!");
+  int state = gsm.sendSMS("774313955", "Hello World!");
   if (state == ERR_NONE) {
     Serial.println(F("success!"));
   } else {
@@ -37,5 +42,6 @@ void loop() {
   }
 
   // wait 10 seconds before sending again
-  delay(10000);
+  //delay(10000);
+  while(true);
 }

src/modules/SIM800.cpp

@@ -4,45 +4,31 @@ SIM800::SIM800(Module* module) {
   _mod = module;
 }
 
-int16_t SIM800::begin(long speed, const char* pin) {
+int16_t SIM800::begin(long speed) {
   // set module properties
   _mod->AtLineFeed = "\r\n";
   _mod->baudrate = speed;
   _mod->init(USE_UART, INT_0);
-  
+
   // empty UART buffer (garbage data)
   _mod->ATemptyBuffer();
-  
+
   // power on
   pinMode(_mod->getInt0(), OUTPUT);
   digitalWrite(_mod->getInt0(), LOW);
   delay(1000);
   pinMode(_mod->getInt0(), INPUT);
-  
+
   // test AT setup
   if(!_mod->ATsendCommand("AT")) {
     return(ERR_AT_FAILED);
   }
-  
+
   // set phone functionality
   if(!_mod->ATsendCommand("AT+CFUN=1")) {
     return(ERR_AT_FAILED);
   }
-  
-  // set SMS message format
-  if(!_mod->ATsendCommand("AT+CMFG=1")) {
-    return(ERR_AT_FAILED);
-  }
-  
-  // set PIN code
-  char cmd[14];
-  strcat(cmd, "AT+CPIN=\"");
-  strcat(cmd, pin);
-  strcat(cmd, "\"");
-  if(!_mod->ATsendCommand(cmd)) {
-    return(ERR_AT_FAILED);
-  }
-  
+
   return(ERR_NONE);
 }
 
@@ -55,5 +41,34 @@ void SIM800::shutdown() {
 }
 
 int16_t SIM800::sendSMS(const char* num, const char* msg) {
+  // set SMS message format to text mode
+  if(!_mod->ATsendCommand("AT+CMGF=1")) {
+    return(ERR_AT_FAILED);
+  }
 
+  // build SMS command and text
+  size_t cmdLen = 9 + strlen(num) + 3;
+  char* cmd = new char[cmdLen];
+  strcpy(cmd, "AT+CMGS=\"");
+  strcat(cmd, num);
+  strcat(cmd, "\"\r");
+
+  size_t textLen = strlen(msg) + 2;
+  char* text = new char[textLen];
+  strcpy(text, msg);
+  text[textLen - 2] = 0x1A;
+  text[textLen - 1] = '\0';
+
+  // send the command
+  _mod->ModuleSerial->print(cmd);
+
+  delay(50);
+
+  // send the text
+  _mod->ModuleSerial->print(text);
+
+  delete[] cmd;
+  delete[] text;
+
+  return(ERR_NONE);
 }

src/modules/SIM800.h

@@ -7,12 +7,12 @@ class SIM800 {
   public:
     // constructor
     SIM800(Module* module);
-    
+
     // basic methods
-    int16_t begin(long speed, const char* pin = "1234");
+    int16_t begin(long speed);
     void shutdown();
     int16_t sendSMS(const char* num, const char* msg);
-  
+
   private:
     Module* _mod;
 };