u-blox / ublox-at-cellular-interface

Implementation of the CellularInterface for u-blox C027 and C030 (non-N2xx flavour) modems that uses the IP stack on-board the cellular modem, hence not requiring LWIP (and so less RAM) and allowing any AT command exchanges to be carried out at the same time as data transfers (since the modem remains in AT mode all the time). This library may be used from mbed 5.5 onwards. If you need to use SMS, USSD or access the modem file system at the same time as using the CellularInterface then use ublox-at-cellular-interface-ext instead.

Dependents:   example-ublox-cellular-interface example-ublox-cellular-interface_r410M example-ublox-mbed-client example-ublox-cellular-interface ... more

Files at this revision

API Documentation at this revision

Revision 15:8cc9a80ac0ad, committed 2018-03-26

Comitter:
RobMeades
Date:
Mon Mar 26 15:33:40 2018 +0100
Parent:
14:e7dcf3388403
Child:
16:2b30a056ae54
Commit message:
Add a check in socket_recv() and socket_send() to see whether the socket has been closed by the remote host. If it has, return NSAPI_ERROR_NO_SOCKET immediately. This is necessary as the socket layers above us have no way of knowing if the remote host has closed the socket. Such a check is not required for socket_recvfrom() and socket_sendto() as UDP has no concept of a socket-connection in the first place.

Changed in this revision

UbloxATCellularInterface.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/UbloxATCellularInterface.cpp	Fri Mar 02 13:28:32 2018 +0000
+++ b/UbloxATCellularInterface.cpp	Mon Mar 26 15:33:40 2018 +0100
@@ -561,6 +561,11 @@
 
     MBED_ASSERT (check_socket(socket));
 
+    if (socket->modem_handle == SOCKET_UNUSED) {
+        tr_debug("socket_send: socket closed");
+        return NSAPI_ERROR_NO_SOCKET;
+    }
+
     while ((count > 0) && success) {
         if (count < blk) {
             blk = count;
@@ -669,6 +674,11 @@
 
     MBED_ASSERT (check_socket(socket));
 
+    if (socket->modem_handle == SOCKET_UNUSED) {
+        tr_debug("socket_recv: socket closed");
+        return NSAPI_ERROR_NO_SOCKET;
+    }
+
     timer.start();
 
     while (success && (size > 0)) {