Diff: Cellular/EasyIP.cpp

Revision:

52:2cb58398a4f9

Parent:

51:ffc556ba33f7

Child:

54:a6c738bfc391

--- a/Cellular/EasyIP.cpp	Tue Aug 05 18:35:22 2014 +0000
+++ b/Cellular/EasyIP.cpp	Mon Aug 11 16:03:19 2014 +0000
@@ -6,8 +6,6 @@
 
 using namespace mts;
 
-
-
 EasyIP::EasyIP(Radio type)
 {
     this->type = type;
@@ -46,7 +44,7 @@
     logDebug("radio type: %s", Cellular::getRadioNames(type).c_str());
     //Turns on the HW flow control
     if(sendBasicCommand("AT&K3", 2000) != MTS_SUCCESS) {
-        logWarning("Failed to set flow control to radio");
+        logWarning("Failed to enable serial flow control");
     }
     return true;
 }
@@ -62,21 +60,17 @@
     }
     
     //Check if socket is open
-    //flag stored in Cellular.h
     if(socketOpened) {
         return true;
     }
 
     //Check if already connected
-    //by calling the function isConnected() in EasyIP.cpp
     if(isConnected()) {
         return true;
     }
     
-    //Create an mbed timer object
     Timer tmr;
     //Check Registration: AT+CREG? == 0,1
-    //(Does the AT command inside Cellular class)
     tmr.start();
     do {
         Registration registration = getRegistration();
@@ -89,7 +83,6 @@
     } while(tmr.read() < 30); 
     
     //Check RSSI: AT+CSQ
-    //Does the command inside Cellular
     tmr.reset();
     do {
         int rssi = getSignalStrength();
@@ -102,14 +95,12 @@
         }
     } while(tmr.read() < 30);
 
-    //Similar to AT#CONNECTIONSTART: Make a PPP connection
+    //Make PPP connection
     if (type == MTSMC_H5 || type == MTSMC_G3) {
         logDebug("Making PPP Connection Attempt. APN[%s]", apn.c_str());
     } else {
         logDebug("Making PPP Connection Attempt");
     }
-    //The main thing going on; Sends the AT command to start a connection
-    //Assuming context is already stored in the modem
     std::string pppResult = sendCommand("AT#SGACT=1,1", 5000);
     std::vector<std::string> parts;
     if(pppResult.find("OK") != std::string::npos) {
@@ -123,15 +114,12 @@
 
     } else {
         pppResult = sendCommand("AT#SGACT?", 2000);
-        if(pppResult.empty() || (pppResult.find("ERROR") != std::string::npos)) {
-            pppConnected = false;
+        if(pppResult.find("1,1") != std::string::npos) {
+           logDebug("Radio is already connected");
+           pppConnected = true;
         } else {
-            if(pppResult.find("1,1") != std::string::npos) {
-                logDebug("Radio is already connected");
-                pppConnected = true;
-            } else {
-                pppConnected = false;
-            }
+            logError("PPP connection attempt failed");
+            pppConnected = false;
         }
     }
 
@@ -140,32 +128,27 @@
 
 void EasyIP::disconnect()
 {
-    //AT#SGACT=1,0: Close a PPP connection
-    logDebug("Closing PPP Connection");    
-    if(socketOpened) {
-        if(!close()) { //Calls another EasyIP function to close socket before disconnect
-            logDebug("Failed to close socket for disconnect");
-            return; //Can't close connection without AT commands
-                    //(and thus need socket closed)
-        }
-    }
+    //AT#SGACT=1,0: Close PPP connection
+    logDebug("Closing PPP Connection"); 
     std::string result;
     Timer tmr;
+       
+    if(socketOpened) {
+        close();
+    }
+    
     //Sends AT#SGACT=1,0 command
     if (sendBasicCommand("AT#SGACT=1,0", 1000) == MTS_SUCCESS) {
-        pppConnected = false;
         logDebug("Successfully closed PPP Connection");
     }
     
-    /* Radio was entering unknown state if ping command was sent after calling 
-     * disconnect, due to context being closed between radio sending ping and 
-     * waiting for ping response (which will never occur with connection closed)
+    /* Ensure PPP link is down, else ping commands will put radio in unknown state
+     * (Link is not immediate in disconnection, even though OK is returned)
      */
     tmr.start();
     while(tmr.read() < 30) {
         result = sendCommand("AT#SGACT?", 1000);
         if(result.find("1,0") != std::string::npos) {
-            pppConnected = false;
             break;
         } else if(result.find("ERROR") != std::string::npos) {
             break;
@@ -174,19 +157,13 @@
         }
     }
     
-    //If still unable to close PPP connection, wait for 30 seconds to drop connection
-    if(pppConnected) {
-        wait(30);
-        pppConnected = false;
-    }
-    
+    pppConnected = false;
     return;
 }
 
 bool EasyIP::isConnected()
 {
-    std::string stateString;
-    std::vector<std::string> pieces;
+    enum RadioState {IDLE, CONNECTING, CONNECTED, DISCONNECTED};
     //state flags for various connection components
     bool signal = false, regist = false, active = false;
     
@@ -199,118 +176,70 @@
     }
     
     //2) Check that we do not have a live connection up
-    if(socketOpened) {
+    if (socketOpened) {
         logDebug("Socket is opened");
         return true;
     }
     
-    
     //3) Query the radio
-    //3.a) Check antenna signal
-    std::string reply = sendCommand("AT+CSQ", 500);
-    if(reply.empty() || (reply.find("ERROR") != std::string::npos)) {
+    int rssi = getSignalStrength();
+    if (rssi == 99 || rssi == -1) {
+        //Signal strength is nonexistent
         signal = false;
     } else {
-        pieces = Text::split(reply, "\r\n");
-        if(pieces.size() >= 2) {
-            pieces = Text::split(pieces[1], " ");
-            if(pieces.size() >= 2) {
-                if((pieces[1].find("0,0") != std::string::npos) || (pieces[1].find("99,99") != std::string::npos)) {
-                    signal = false;
-                } else {
-                    signal = true;
-                }
-            }
-        }
+        signal = true;
     }
     
-    //3.b) Check cell tower registration
-    reply = sendCommand("AT+CREG?", 500);
-    if(reply.empty() || (reply.find("ERROR") != std::string::npos)) {
-        regist = false;
+    Registration creg = getRegistration();
+    if (creg == REGISTERED) {
+        regist = true;
     } else {
-        pieces = Text::split(reply, "\r\n");
-        if(pieces.size() >= 2) {
-            pieces = Text::split(pieces[1], " ");
-            if(pieces.size() >= 2) {
-                if((pieces[1].find("0,1") != std::string::npos) || (pieces[1].find("0,5") != std::string::npos)) {
-                    regist = true; //1 for connected, 5 for roaming connected
-                } else {
-                    regist = false; //Cell tower not registered
-                }
-            }
-        }
+        regist = false;
     }
     
-    //3.c) Check active context (SGACT = 1,1)
-    reply = sendCommand("AT#SGACT?", 500);
-    if(reply.empty() || (reply.find("ERROR") != std::string::npos)) {
-        active = false;
+    string reply = sendCommand("AT#SGACT?", 500);
+    if (reply.find("1,1") != std::string::npos) {
+        active = true;
     } else {
-        pieces = Text::split(reply, "\r\n");
-        if(pieces.size() >= 2) {
-            pieces = Text::split(pieces[1], " ");
-            if(pieces.size() >= 2) {
-                if(pieces[1].find("1,1") != std::string::npos) {
-                    active = true; //1 for an active connection mode
-                } else {
-                    active = false; //0, or unknown value, is an inactive connection mode
-                }
-            }
-        }
+        active = false;
     }
-    //4) Determine radio state
-    if(regist && signal) {
-        if(pppConnected) {
-            if(active) {
-                if(ping()) {
-                    stateString = "CONNECTED";
-                    pppConnected = true;
-                } else {
-                    stateString = "AUTHENTICATING";
-                    pppConnected = true;
-                    return false; //Return false instead of changing pppConnected due to the fact
-                                  //that it is connected to ppp, it just can't ping successfully
-                }
-            } else {
-                stateString = "DISCONNECTING";
-                pppConnected = false;
-            }
-        } else {
-            if(active) {
-                if(ping()) {
-                    pppConnected = true;
-                    stateString = "CONNECTED";
-                } else {
-                    stateString = "CONNECTING";
-                }
-            } else {
-                stateString = "IDLE";
-            }
-        }
-    } else if(regist != signal) {
-        stateString = "CHECKING";
-        return false;
-    } else if(!regist && !signal) {
-        stateString = "DISCONNECTED";
+    
+    RadioState state;
+    bool ppp = pppConnected;
+    if (signal && regist && active) {
+        //Radio connected
+        state = CONNECTED;
+        pppConnected = true;
+    } else if (signal && !regist && !active) {
+        //Radio idle
+        state = IDLE;
+        pppConnected = false;
+    } else if (active) {
+        //Radio Connecting
+        state = CONNECTING;
+    } else {
+        //Radio Disconnected
+        state = DISCONNECTED;
         pppConnected = false;
     }
     
-    std::string pppStatus = pppConnected ? "CONNECTED" : "DISCONNECTED";
-    if(stateString != pppStatus) {
-        logDebug("Internal PPP state[%s], radio state[%s])",pppStatus.c_str() ,stateString.c_str());
+    if (!ppp && state == CONNECTED) {
+        logWarning("Internal PPP state tracking differs from radio (DISCONNECTED:CONNECTED)");
+    } else if (ppp && state != CONNECTED) {
+        logWarning("Internal PPP state tracking differs from radio (CONNECTED:%s)", state);
     }
+    
     return pppConnected;
 }
 
-//Resets the radio
 void EasyIP::reset()
 {
     disconnect();
+    
     if(sendBasicCommand("AT#REBOOT", 10000) != MTS_SUCCESS) {
-        logError("Socket Modem did not accept RESET command\n\r");
+        logError("Socket Modem did not accept RESET command");
     } else {
-        logWarning("Socket Modem is resetting, allow 30 seconds for it to come back\n\r");
+        logWarning("Socket Modem is resetting, allow 30 seconds for it to come back");
         return;
     }
 }
@@ -417,7 +346,7 @@
 bool EasyIP::isOpen()
 {
     if(io->readable()) {
-        logDebug("Assuming open, data available to read.\n\r");
+        logDebug("Assuming open, data available to read.");
         return true;
     }
     return socketOpened;
@@ -597,7 +526,7 @@
     if (address.compare("DHCP") == 0) {
         return true;
     } else {
-        logWarning("Radio does not support static IPs, using DHCP.\n\r");
+        logWarning("Radio does not support static IPs, using DHCP.");
         return false;
     }
 }
@@ -641,7 +570,6 @@
 {
     char buffer[256] = {0};
     std::vector<std::string> parts;
-    int pingsRec=0;
     int TTL=0;
     int Timeout=0;
     
@@ -650,12 +578,7 @@
     
     for(int pngs=0; pngs<PINGNUM; pngs++) {
         std::string response = sendCommand(buffer, (PINGDELAY*2000)); //Send 1 ping
-        wait(0.5); //Radio seems to get stuck if no wait is incurred between issuing ping commands
-                   //leads to unknown registration state eventually :(
-        if(response.empty()) {
-            continue; //Skip current loop if send command fails
-        }
-        if(response.find("ERROR") != std::string::npos) {
+        if(response.empty() || response.find("ERROR") != std::string::npos) {
             continue; //Skip current loop if send command fails
         }
         parts = Text::split(response, "\r\n");
@@ -671,12 +594,9 @@
         TTL = std::atoi(parts[3].c_str());
                 
         if((Timeout < 600) && (TTL < 255)) {
-            pingsRec++;
-        }
-    }   //Success if less than 50% packet loss
-        if( ((pingsRec/PINGNUM)>= 0.5) ) {
             return true;
         }
+    }   
     return false;
 }
 
@@ -706,7 +626,8 @@
         return false;
     }
     if(!socketOpened) {
-        logError("Socket is not open. +++ Escape sequence should fail");
+        logError("Socket is not open.");
+        return false;
     }
     
     if(!socketCloseable) {
@@ -718,43 +639,40 @@
     io->txClear();
     
     std::string result;
-    unsigned int timeoutMillis = 10000; //time in ms
+    unsigned int timeoutMillis = 10000;
     //Attempt to write command
-    wait(1.2); //Format for +++ command is 1 second wait, send +++, then another second wait
-             //1s wait after command is implemented as a polling function for 2 seconds
-             //Option: Could change wait periods to be longer/shorter (0-255)*50ms
+    //Format for +++ command is 1 second wait, send +++, then another second wait
+    wait(1.2); 
     if(io->write("+++", 3, timeoutMillis) != 3) {
         //Failed to write command
         logError("failed to send command to radio within %d milliseconds", timeoutMillis);
         return false;
     }
     
-    int timer = 0;
+    Timer tmr;
     char tmp[256];
     tmp[255] = 0;
     bool done = false;
-    io->read(tmp,255,0);
     bool exitmode = false;
-    
+    tmr.start();
     do {
-        wait(0.1);
-        timer += 100;
         //Make a non-blocking read call by passing timeout of zero
-            int size = io->read(tmp,255,0);    //1 less than allocated (timeout is instant)
-            if(size > 0) {
-                result.append(tmp, size);
-            }
+        int size = io->read(tmp,255,0);    //1 less than allocated (timeout is instant)
+        if(size > 0) {
+            result.append(tmp, size);
+        }
         if(result.find("OK") != std::string::npos) {
             exitmode = true;
             done = true;
         } else if(result.find("NO CARRIER") != std::string::npos) {
+            socketOpened = false;
             exitmode = true;
             done = true;
         } else if(result.find("ERROR") != std::string::npos) {
             exitmode = false;
             done = true;
         }
-        if(timer >= timeoutMillis) {
+        if(tmr.read_ms() >= timeoutMillis) {
             logDebug("Escape sequence [+++] timed out after %d milliseconds", timeoutMillis);
             exitmode = true;
             done = true;
@@ -766,40 +684,37 @@
 
 bool EasyIP::socketCheck() {
     bool status = false;
-    std::string socketInfo = "9"; //9 is unrecognized
+    int socketInfo = 9; //error
+    enum SocketStatus {SOCKETCLOSED, SOCKETACTIVEDATA, SOCKETSUSPEND, SOCKETSUSPENDDATA, SOCKETLISTEN, SOCKETINCOMING, ERROR = 9};
     std::vector<std::string> params;
     
     //Goes from data mode to command mode
     if(sendEscapeCommand()) {
-        socketOpened = false;
-        if(sendBasicCommand("AT", 1000) == MTS_SUCCESS) {
-            socketInfo = sendCommand("AT#SS=1", 2000);
-            if(socketInfo.find("OK") != std::string::npos) {
-                //Found valid response
-                params = Text::split(socketInfo, "\r\n");
-                params = Text::split(params[1], ",");
-                socketInfo = params[1];
-                //Check comparison of params[1] to response codes
-            } else {
-                logError("Could not determine socket status[%s]",socketInfo.c_str());
-                socketInfo == "9"; //9 is unrecognized
-            }
+        std::string reply = sendCommand("AT#SS=1", 2000);
+        if(reply.find("OK") != std::string::npos) {
+            //Found valid response
+            params = Text::split(reply, "\r\n");
+            params = Text::split(params[1], ",");
+            socketInfo = atoi(params[1].c_str());
+        } else {
+            logError("Could not determine socket status[%d]",socketInfo);
+            socketInfo = 9; //9 is unrecognized
         }
     } else {
         status = false; //Return value of socketOpened when checking
     }
     
     //Check socket status query
-    if(socketInfo == "2" || socketInfo == "3" || socketInfo == "1" || socketInfo == "4") {
-        status = true; //2 and 3 are suspended connections
-    } else if(socketInfo == "0" || socketInfo == "5") {
-        status = false; //0 is closed socket, probably won't occur
+    if(socketInfo < 5 && socketInfo > 0) { //Socket opened responses
+        status = true;
+    } else if(socketInfo == SOCKETCLOSED || socketInfo == SOCKETINCOMING) {
+        status = false;
     } else {
         logError("Could not determine socket status");
-        status = false; //anything else is unknown status
+        status = false;
     }
     
-    //Reconnects to active socket if able
+    //Reconnect to active socket if able
     if(status) {
         std::string reconnect = sendCommand("AT#SO=1", 2000);
         if(reconnect.find("CONNECT") != std::string::npos || reconnect.find("OK") != std::string::npos) {