Fix several potential null pointers

Signed-off-by: Sara Damiano <sdamiano@stroudcenter.org>

src/TinyGsmClientESP8266.h

@@ -315,7 +315,10 @@ class TinyGsmESP8266 : public TinyGsmModem<TinyGsmESP8266>,
       // if the status is anything but 3, there are no connections open
       waitResponse();  // Returns an OK after the status
       for (int muxNo = 0; muxNo < TINY_GSM_MUX_COUNT; muxNo++) {
-        sockets[muxNo]->sock_connected = false;
+        GsmClientESP8266* sock = sockets[muxNo];
+        if (sock) {
+          sock->sock_connected = false;
+        }
       }
       return false;
     }
@@ -336,7 +339,10 @@ class TinyGsmESP8266 : public TinyGsmModem<TinyGsmESP8266>,
       if (has_status == 2) break;  // once we get to the ok, stop
     }
     for (int muxNo = 0; muxNo < TINY_GSM_MUX_COUNT; muxNo++) {
-      sockets[muxNo]->sock_connected = verified_connections[muxNo];
+      GsmClientESP8266* sock = sockets[muxNo];
+      if (sock) {
+        sock->sock_connected = verified_connections[muxNo];
+      }
     }
     return verified_connections[mux];
   }

src/TinyGsmClientSIM5360.h

@@ -217,8 +217,13 @@ class TinyGsmSim5360 : public TinyGsmModem<TinyGsmSim5360>,
   bool restartImpl() {
     if (!testAT()) { return false; }
     sendAT(GF("+REBOOT"));
+    // Should return an 'OK' after reboot command is sent
     if (waitResponse(10000L) != 1) { return false; }
-    delay(3000L);  // TODO(?):  Test this delay!
+    // After booting, modem sends out messages as each of its
+    // internal modules loads.  The final message is "PB DONE".
+    if (waitResponse(40000L, GF(GSM_NL "PB DONE")) != 1) {
+      return false;
+    }
     return init();
   }
 
@@ -574,7 +579,13 @@ class TinyGsmSim5360 : public TinyGsmModem<TinyGsmSim5360>,
     if (waitResponse(GF("+CIPCLOSE:")) != 1) { return false; }
     for (int muxNo = 0; muxNo < TINY_GSM_MUX_COUNT; muxNo++) {
       // +CIPCLOSE:<link0_state>,<link1_state>,...,<link9_state>
-      sockets[muxNo]->sock_connected = stream.parseInt();
+      bool thisMuxState = stream.parseInt();
+      // Need to make sure a socket instace for the socket number exists
+      // before setting its state
+      GsmClientSim5360* sock = sockets[muxNo];
+      if (sock) {
+        sock->sock_connected = thisMuxState;
+      }
     }
     waitResponse();  // Should be an OK at the end
     return sockets[mux]->sock_connected;

src/TinyGsmClientSIM7600.h

@@ -672,7 +672,13 @@ class TinyGsmSim7600 : public TinyGsmModem<TinyGsmSim7600>,
     }
     for (int muxNo = 0; muxNo < TINY_GSM_MUX_COUNT; muxNo++) {
       // +CIPCLOSE:<link0_state>,<link1_state>,...,<link9_state>
-      sockets[muxNo]->sock_connected = stream.parseInt();
+      bool thisMuxState = stream.parseInt();
+      // Need to make sure a socket instace for the socket number exists
+      // before setting its state
+      GsmClientSim7600* sock = sockets[muxNo];
+      if (sock) {
+        sock->sock_connected = thisMuxState;
+      }
     }
     waitResponse();  // Should be an OK at the end
     return sockets[mux]->sock_connected;

src/TinyGsmClientSequansMonarch.h

@@ -571,7 +571,9 @@ class TinyGsmSequansMonarch
     // six possible sockets.
     sendAT(GF("+SQNSS"));
     for (int muxNo = 1; muxNo <= TINY_GSM_MUX_COUNT; muxNo++) {
-      if (waitResponse(GFP(GSM_OK), GF(GSM_NL "+SQNSS: ")) != 2) { break; }
+      if (waitResponse(GFP(GSM_OK), GF(GSM_NL "+SQNSS: ")) != 2) {
+        break;
+      }
       uint8_t status = 0;
       // if (streamGetIntBefore(',') != muxNo) { // check the mux no
       //   DBG("### Warning: misaligned mux numbers!");
@@ -588,10 +590,13 @@ class TinyGsmSequansMonarch
       // SOCK_LISTENING              = 4,
       // SOCK_INCOMING               = 5,
       // SOCK_OPENING                = 6,
-      sockets[muxNo % TINY_GSM_MUX_COUNT]->sock_connected =
+      GsmClientSequansMonarch* sock = sockets[mux % TINY_GSM_MUX_COUNT];
+      if (sock) {
+        sock->sock_connected =
             ((status != SOCK_CLOSED) && (status != SOCK_INCOMING) &&
              (status != SOCK_OPENING));
       }
+    }
     waitResponse();  // Should be an OK at the end
     return sockets[mux % TINY_GSM_MUX_COUNT]->sock_connected;
   }
@@ -601,7 +606,7 @@ class TinyGsmSequansMonarch
      */
    public:
     // TODO(vshymanskyy): Optimize this!
-  int8_t waitResponse(uint32_t timeout_ms, String& data,
+    int8_t waitResponse(uint32_t timeout_ms, String & data,
                         GsmConstStr r1 = GFP(GSM_OK),
                         GsmConstStr r2 = GFP(GSM_ERROR),
 #if defined TINY_GSM_DEBUG
@@ -705,6 +710,6 @@ class TinyGsmSequansMonarch
   Stream&                  stream;
   GsmClientSequansMonarch* sockets[TINY_GSM_MUX_COUNT];
   const char*              gsmNL = GSM_NL;
-};
+  };
 
 #endif  // SRC_TINYGSMCLIENTSEQUANSMONARCH_H_