diff --git a/src/filter.c b/src/filter.c
index ae99d32..40e67ba 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -2436,8 +2436,8 @@ int filter_commands(struct worker_t *self, struct client_t *c, const char *s, in
 	int i, argc;
 
 	/* skip over the #filter in the beginning of the command */
-	len -= 7;
-	s   += 7;
+	len -= 6;
+	s   += 6;
 
 	if ( *s == '?' && len == 1 ) {
 		/* Query current filters */
diff --git a/src/incoming.c b/src/incoming.c
index 963b8c9..393d703 100644
--- a/src/incoming.c
+++ b/src/incoming.c
@@ -667,8 +667,9 @@ int incoming_uplinksim_handler(struct worker_t *self, struct client_t *c, int l4
 		/* filter adjunct commands ? */
 		/* TODO: is some client sending "# filter" instead? Should accept maybe? */
 		/* Yes, aprssrvr accept #kjhflawhiawuhglawuhfilter too - as long as it has filter in the end. */
-		if (strncasecmp(s, "#filter", 7) == 0)
-			return filter_commands(self, c, s, len);
+		char *filtercmd = strstr(s, "filter");
+		if (filtercmd)
+			return filter_commands(self, c, filtercmd, len - (filtercmd - s));
 		return 0;
 	}
 	
@@ -715,8 +716,9 @@ int incoming_handler(struct worker_t *self, struct client_t *c, int l4proto, cha
 		if (l4proto != IPPROTO_UDP) {
 			/* filter adjunct commands ? */
 			/* TODO: check if the socket type allows filter commands! */
-			if (strncasecmp(s, "#filter", 7) == 0)	
-				return filter_commands(self, c, s, len);
+			char *filtercmd = strstr(s, "filter");
+			if (filtercmd)
+				return filter_commands(self, c, filtercmd, len - (filtercmd - s));
 			
 			hlog(LOG_DEBUG, "#-in: '%.*s'", len, s);
 		}
diff --git a/src/login.c b/src/login.c
index 7488600..7b00c54 100644
--- a/src/login.c
+++ b/src/login.c
@@ -140,7 +140,10 @@ int login_handler(struct worker_t *self, struct client_t *c, int l4proto, char *
 					
 			}
 
-		} else if (strcasecmp(argv[i], "filter") == 0) {
+		} else if (strstr(argv[i], "filter")) {
+                        /* Follows javaaprssrvr's example - any command having 'filter' in the
+                         * end is OK.
+                         */
 			if (!(c->flags & CLFLAGS_USERFILTEROK)) {
 				return client_printf(self, c, "# No user-specified filters on this port\r\n");
 			}
diff --git a/tests/t/30filter-cmd.t b/tests/t/30filter-cmd.t
new file mode 100644
index 0000000..76c5e89
--- /dev/null
+++ b/tests/t/30filter-cmd.t
@@ -0,0 +1,104 @@
+#
+# Filter command testing
+#
+# Filter can be set either by a "server adjunct command" in the login:
+# user <username> pass <passcode> vers <soft> <vers> filter <filterstring>
+#
+# or with a #command in the incoming stream:
+# "# filter <filterstring>"
+# "#filter <filterstring>"
+# "#alfhilawuehflwieuhffilter <filterstring>"
+#
+# Yes, the command can be prefixed with anything, even in the "user"
+# command.
+#
+
+use Test;
+BEGIN { plan tests => 6 + 1 + 2 + 2 + 2 + 3 };
+use runproduct;
+use istest;
+use Ham::APRS::IS;
+use Time::HiRes qw(sleep);
+
+my $p = new runproduct('basic');
+
+ok(defined $p, 1, "Failed to initialize product runner");
+ok($p->start(), 1, "Failed to start product");
+
+my $login = "N5CAL-1";
+my $server_call = "TESTING";
+my $i_tx = new Ham::APRS::IS("localhost:55580", $login);
+ok(defined $i_tx, 1, "Failed to initialize Ham::APRS::IS");
+
+# First filter is for uncompressed packet, second for compressed,
+# third for mic-e, fourth for prefix filter test.
+# The first and last one also test upper-case letters as filter keys.
+my $i_rx = new Ham::APRS::IS("localhost:55580", "N5CAL-2",
+	'filter' => 'p/OH');
+ok(defined $i_rx, 1, "Failed to initialize Ham::APRS::IS");
+
+my $ret;
+$ret = $i_tx->connect('retryuntil' => 8);
+ok($ret, 1, "Failed to connect to the server: " . $i_tx->{'error'});
+
+$ret = $i_rx->connect('retryuntil' => 8);
+ok($ret, 1, "Failed to connect to the server: " . $i_rx->{'error'});
+
+# do the actual tests
+my($tx, $rx, $helper);
+
+# check that the initial p/ filter works
+$tx = $rx = "OH2SRC>APRS,qAR,$login:>should pass";
+istest::txrx(\&ok, $i_tx, $i_rx, $tx, $rx);
+
+# change filter
+$i_rx->sendline("#filter p/N/K");
+sleep(0.2);
+
+# check that the new filter is applied
+$tx = "OH2SRC>APRS,qAR,$login:>should drop";
+$helper = "K2SRC>APRS,qAR,$login:>should pass";
+istest::should_drop(\&ok, $i_tx, $i_rx, $tx, $helper);
+
+$tx = "OH2SRC>APRS,qAR,$login:>should drop2";
+$helper = "N2SRC>APRS,qAR,$login:>should pass2";
+istest::should_drop(\&ok, $i_tx, $i_rx, $tx, $helper);
+
+# change filter, with some spaces
+$i_rx->sendline("#  filter   p/N/K  ");
+sleep(0.2);
+
+# check that the new filter is applied
+$tx = "OH2SRC>APRS,qAR,$login:>should drop3";
+$helper = "K2SRC>APRS,qAR,$login:>should pass3";
+istest::should_drop(\&ok, $i_tx, $i_rx, $tx, $helper);
+
+$tx = "OH2SRC>APRS,qAR,$login:>should drop4";
+$helper = "N2SRC>APRS,qAR,$login:>should pass4";
+istest::should_drop(\&ok, $i_tx, $i_rx, $tx, $helper);
+
+# change filter, with some rubbish in front
+$i_rx->sendline("#blaablaaanxauyg3iuyq2gfilter p/OG/OF/OH");
+sleep(0.2);
+
+# check that the new filter is applied
+$tx = "K2SRC>APRS,qAR,$login:>should drop5";
+$helper = "OH2SRC>APRS,qAR,$login:>should pass5";
+istest::should_drop(\&ok, $i_tx, $i_rx, $tx, $helper);
+
+$tx = "N2SRC>APRS,qAR,$login:>should drop6";
+$helper = "OH2SRC>APRS,qAR,$login:>should pass6";
+istest::should_drop(\&ok, $i_tx, $i_rx, $tx, $helper);
+
+# disconnect
+
+$ret = $i_rx->disconnect();
+ok($ret, 1, "Failed to disconnect from the server: " . $i_rx->{'error'});
+
+$ret = $i_tx->disconnect();
+ok($ret, 1, "Failed to disconnect from the server: " . $i_tx->{'error'});
+
+# stop
+
+ok($p->stop(), 1, "Failed to stop product");
+
diff --git a/tests/t/30parser-filter.t b/tests/t/30parser-filter.t
index 5b72a8d..b405253 100644
--- a/tests/t/30parser-filter.t
+++ b/tests/t/30parser-filter.t
@@ -7,6 +7,8 @@
 # the positions in these packets, and also quickly try out the
 # p/ prefix filter
 #
+# TODO: add more filter test cases for the rest of the filters
+#
 
 use Test;
 BEGIN { plan tests => 17 };