User’s Manual
When incoming connection request is detected, ESERV-10’s firewall uses the Firewall mask (bit
wise AND) to filter out the network part of the incoming request. After that the calculated IP address
is compared to the configured IP network address. If both are equal, the connection is granted.
Otherwise the connection is rejected.
Example:
Let us assume the following ESERV-10 settings: Firewall mask: 255.255.0.0 and Allowed IP
network: 172.16.0.0. If the incoming connection request is from address 172.16.8.2, the result
of the Firewall mask AND Incoming IP address is 172.16.0.0, which is same as the Allowed IP
network. Therefore, the connection is granted.
For allowing all connections, set both the Firewall mask and Allowed IP network: 0.0.0.0.
For denying all connections, set the Firewall mask to value 255.255.255.255 and Allowed IP
network to 0.0.0.0.
Filtering Incoming E-mails
User can define the domain (e.g. violasystems.com) from where ESERV-10 accepts incoming e-
mail messages. The checking of domain can be disabled by setting the allowed domain parameter
to value ‘-‘.
E-mail Features
ESERV-10 has features for receiving and sending ASCII based e-mails in either automode or AT
command controlled way. The supported AT commands for the ESERV-10 are listed in the
Appendix 4. For e-mail features ESERV-10 needs to be configured to know:
1. IP address of SMTP server (outgoing e-mail)
2. IP address of POP3 server (incoming e-mail)
3. Username and password of POP3 server
4. ESERV-10’s own e-mail address
5. Recipient e-mail address (can also be given by AT command) and
6. Subject to be sent on outgoing e-mails.
For receiving e-mails the maximum length and allowed domain of incoming e-mail can be
configured. The parameter configuration can be carried out, for example, using the Viola
Configurator.
Sending E-mail in Automode
When ESERV-10 is configured to send e-mail automatically it needs the IP address of the SMTP
server, recipient’s e-mail address and e-mail subject. ESERV-10 sends the buffered serial data to
SMTP server and closes the message connection after that. The mail sending procedure is
triggered by delay, amount or delimiter transmission algorithm.
Receiving E-mail in Automode
ESERV-10 checks from POP3 server on predefined intervals if there is new mail on the mailbox.
For every e-mail message ESERV-10 checks the length of the message and the domain of the
sender. ESERV-10 rejects the message if it’s too long or if the domain is not allowed. This is the
default procedure but the parameters related to this operation can also be disabled. If the message
is acceptable ESERV-10 sends the message part into the serial port and starts to process a new
mail message.
Other options available for the incoming e-mail processing include options to disable or enable to
transfer the sender and subject of e-mail data to the serial port in addition to the normal plain
message data.
ESERV-10
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Viola Systems Ltd.
