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) {

src/TinyGsmClientM95.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(60000L, GF("CLOSED"), GF("CLOSE OK"), GF("ERROR"));
-    rx.clear();
   }
 
   virtual size_t write(const uint8_t *buf, size_t size) {

src/TinyGsmClientMC60.h

@@ -93,10 +93,20 @@ 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(60000L, GF("CLOSED"), GF("CLOSE OK"), GF("ERROR"));
-    rx.clear();
   }
 
   virtual size_t write(const uint8_t *buf, size_t size) {

src/TinyGsmClientSIM800.h

@@ -95,10 +95,20 @@ 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("+CIPCLOSE="), mux);
     sock_connected = false;
     at->waitResponse();
-    rx.clear();
   }
 
   virtual size_t write(const uint8_t *buf, size_t size) {

src/TinyGsmClientUBLOX.h

@@ -86,9 +86,11 @@ public:
   }
 
   virtual void stop() {
-    // Read and dump anything remaining in the u-blox buffer
+    // 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);