| cyg_modbus_acm_add | ||
|---|---|---|
 | 110.3. ModbusTCP specific API |  |
Name
cyg_modbus_acm_add — Add client address to Access Control Mechanism pool
Synopsis
#include <cyg/modbus.h>
Cyg_ErrNo cyg_modbus_acm_add(cyg_handle_t server, cyg_modbus_acm_pool ptype, const struct sockaddr *ipaddr, socklen_t addrlen);
Description
Depending on the CYGPKG_MODBUS and user
application configuration, the ModbusTCP transport layer may provide
support for an Access Control Mechanism (ACM) based on
client (remote host) network addresses. This function allows addresses
to be registered, so that subsequent connections from the remote host
will be allowed.
The ptype defines which of the
ModbusTCP ACM pools the supplied client address will be
registered with:
MODBUS_CONNPOOL_PRI
The priority pool is for addresses for which the server should never close the socket connection.
MODBUS_CONNPOOL_NONPRI
The non-priority pool is for addresses where the server may close the socket connection.
Currently the ipaddr can
describe either a AF_INET (for IPv4)
or AF_INET6 (for IPv6) family address,
with addrlen being the size of the relevant
address family.
Return value
A standard Cyg_ErrNo error code is returned,
with ENOERR indicating success. If the ModbusTCP
ACM is not provided by the attached transport layer
then ENOENT is returned. The
error EIO indicates a failure to communicate with
the server control thread. The transport specific implementation may
return further error indications as appropriate.
| |  | |
| cyg_modbus_get_uid |  | cyg_modbus_acm_remove |
| 2024-03-18 | eCosPro Non-Commercial Public License |