Merge branch 'master' into develop

src/TinyGsmCommon.h

@@ -117,3 +117,18 @@ uint32_t TinyGsmAutoBaud(T& SerialAT, uint32_t minimum = 9600,
 }
 
 #endif  // SRC_TINYGSMCOMMON_H_
+
+// Asks for International Mobile Subscriber Identity IMSI via the AT+CIMI command
+#define TINY_GSM_MODEM_GET_IMSI_CIMI() \
+  String getIMSI() { \
+    sendAT(GF("+CIMI")); \
+    if (waitResponse(GF(GSM_NL)) != 1) { \
+      return ""; \
+    } \
+    String res = stream.readStringUntil('\n'); \
+    waitResponse(); \
+    res.trim(); \
+    return res; \
+  }
+
+