Cellular: Added WISE-1570 handling for socket closing URC

Author: Mirela Chirica

features/cellular/framework/targets/QUECTEL/BC95/QUECTEL_BC95_CellularStack.cpp

@@ -27,6 +27,7 @@ using namespace mbed_cellular_util;
 QUECTEL_BC95_CellularStack::QUECTEL_BC95_CellularStack(ATHandler &atHandler, int cid, nsapi_ip_stack_t stack_type) : AT_CellularStack(atHandler, cid, stack_type)
 {
     _at.set_urc_handler("+NSONMI:", mbed::Callback<void()>(this, &QUECTEL_BC95_CellularStack::urc_nsonmi));
+    _at.set_urc_handler("+NSOCLI:", mbed::Callback<void()>(this, &QUECTEL_BC95_CellularStack::urc_nsocli));
 }
 
 QUECTEL_BC95_CellularStack::~QUECTEL_BC95_CellularStack()
@@ -88,6 +89,28 @@ void QUECTEL_BC95_CellularStack::urc_nsonmi()
     }
 }
 
+void QUECTEL_BC95_CellularStack::urc_nsocli()
+{
+    int sock_id = _at.read_int();
+
+   const nsapi_error_t err = _at.get_last_error();
+
+    if (err != NSAPI_ERROR_OK) {
+        return;
+    }
+
+    CellularSocket *sock = find_socket(sock_id);
+
+    if (sock) {
+        sock->closed = true;
+        if (sock->_cb) {
+            sock->_cb(sock->_data);
+        }
+        tr_error("Socket closed %d", sock_id);
+    }
+}
+
+
 int QUECTEL_BC95_CellularStack::get_max_socket_count()
 {
     return BC95_SOCKET_MAX;
@@ -100,6 +123,11 @@ bool QUECTEL_BC95_CellularStack::is_protocol_supported(nsapi_protocol_t protocol
 
 nsapi_error_t QUECTEL_BC95_CellularStack::socket_close_impl(int sock_id)
 {
+    CellularSocket *sock = find_socket(sock_id);
+
+    if (sock && sock->closed) {
+        return NSAPI_ERROR_OK;
+    }
     _at.cmd_start("AT+NSOCL=");
     _at.write_int(sock_id);
     _at.cmd_stop_read_resp();

features/cellular/framework/targets/QUECTEL/BC95/QUECTEL_BC95_CellularStack.h

@@ -57,6 +57,7 @@ class QUECTEL_BC95_CellularStack : public AT_CellularStack {
 private:
     // URC handlers
     void urc_nsonmi();
+    void urc_nsocli();
 };
 } // namespace mbed
 #endif /* QUECTEL_BC95_CELLULARSTACK_H_ */