u-blox / C027_Support

support library for C027 helper functions for Buffer Pipes, Buffered Serial Port (rtos capable) and GPS parsing. It includes modem APIs for USSD, SMS and Sockets.

Dependents:   HTTPClient_Cellular_HelloWorld Cellular_HelloMQTT MbedSmartRestMain Car_Bon_car_module ... more

This library is intended to be used with u-blox products such as the C027 or a shield with u-blox cellular and GPS modules like the cellular and positioning shield from Embedded Artist.

For 2G/GSM and 3G/UMTS you need to:

  • have a SIM card and know its PIN number
  • need to know you network operators APN setting These setting should be passed to the connect or init and join functions. You can also extend the APN database in MDMAPN.h.

For CDMA products you need to make sure that you have provisioned and activated the modem with either Sprint or Verizon.

Diff: MDM.cpp

Revision:
131:965a7cbc1e58
Parent:
130:3189949981ec
Child:
133:57b208dd96fb
--- a/MDM.cpp	Fri Aug 28 12:40:05 2015 +0000
+++ b/MDM.cpp	Tue Sep 01 15:50:06 2015 +0000
@@ -752,6 +752,23 @@
     return false;
 }
 
+bool MDMParser::_activateProfileReuseExternal(void)
+{
+    int cid = -1;
+    sendFormated("AT+CGDCONT?\r\n");
+    if (RESP_OK != waitFinalResp(_cbCGDCONT, &cid))
+        return false;
+    if (cid == -1)
+        return false;
+    // we found a context that provides us a valid IP so lets reuse it for the internal IP stack
+    sendFormated("AT+UPSD=" PROFILE ",100,%d\r\n", cid);
+    if (RESP_OK != waitFinalResp())
+        return false;
+    // Activate the profile and make connection
+    sendFormated("AT+UPSDA=" PROFILE ",3\r\n");
+    return (RESP_OK == waitFinalResp(NULL,NULL,150*1000));
+}
+
 bool MDMParser::_activateProfileByCid(int cid, const char* apn, const char* username, const char* password, Auth auth)
 {
     sendFormated("AT+CGDCONT=%d,\"IP\",\"%s\"\r\n", cid, apn);
@@ -768,6 +785,22 @@
     return (RESP_OK == waitFinalResp(NULL,NULL,150*1000));
 }
  
+int MDMParser::_cbCGDCONT(int type, const char* buf, int len, int* cid)
+{
+    // accept with and without leading \r\n in +CGDCONT:
+    if ((type == TYPE_PLUS) && (buf[0] == '\r') && (buf[1] == '\n') && (len >= 2))
+        buf += 2, len -= 2, type = TYPE_UNKNOWN;
+    if (type == TYPE_UNKNOWN) {
+        int a,b,c,d,t;
+        //+CGDCONT: <cid>,"IP","<apn name>","<ip adr>",0,0,0,0,0,0
+        if (sscanf(buf, "+CGDCONT: %d,\"IP\",\"%*[^\"]\",\"" IPSTR "\",%*d,%*d,%*d,%*d,%*d,%*d", &t, &a,&b,&c,&d) == 5) {
+            if (IPADR(a,b,c,d) != NOIP) 
+                *cid = t;
+        }
+    }
+    return WAIT;
+}
+
 MDMParser::IP MDMParser::join(const char* apn /*= NULL*/, const char* username /*= NULL*/, 
                               const char* password /*= NULL*/, Auth auth /*= AUTH_DETECT*/)
 {
@@ -824,8 +857,13 @@
                 TRACE("Testing APN Settings(\"%s\",\"%s\",\"%s\",%d)\r\n", apn, username, password, auth);
                 if ((_dev.dev != DEV_TOBY_L2) && (_dev.dev != DEV_MPCI_L2))
                     ok = _activateProfile(apn, username, password, auth);
-                else
-                    ok = _activateProfileByCid(1, apn, username, password, auth);
+                else {
+                    ok = _activateProfileReuseExternal();
+                    if (ok) 
+                        TRACE("Reusing External Context\r\n");
+                    else
+                        ok = _activateProfileByCid(1, apn, username, password, auth);
+                }
             } while (!ok && config && *config); // maybe use next setting ? 
             if (!ok) {
                 ERROR("Your modem APN/password/username may be wrong\r\n");