Propogate fixes to stop

src/TinyGsmClientBG96.h

@@ -89,10 +89,20 @@ public:
 
   virtual void stop() {
     TINY_GSM_YIELD();
+    // Read and dump anything remaining in the modem's internal buffer.
+    // The socket will appear open in response to connected() even after it
+    // closes until all data is read from the buffer.
+    // Doing it this way allows the external mcu to find and get all of the data
+    // that it wants from the socket even if it was closed externally.
+    at->maintain();
+    while (sock_available > 0) {
+      sock_available -= at->modemRead(TinyGsmMin((uint16_t)rx.free(), sock_available), mux);
+      rx.clear();
+      at->maintain();
+    }
     at->sendAT(GF("+QICLOSE="), mux);
     sock_connected = false;
     at->waitResponse();
-    rx.clear();
   }
 
   virtual size_t write(const uint8_t *buf, size_t size) {