Raise errors flags for ecm/emm processing only after couple of bad events.

This prevents unnececary warnings. Sometimes OSCAM responds with error
and on the next query everything is OK. So before raising errors flags
try a couple of times.

camd.c

@@ -139,8 +139,11 @@ READ:
 			data[0],
 			data[0] == 0x08 ? "No card" :
 			data[0] == 0x44 ? "No code word found" : "Unknown");
-		c->key->is_valid_cw = 0;
-		memcpy(c->key->cw, invalid_cw, 16);
+		c->ecm_recv_errors++;
+		if (c->ecm_recv_errors >= ECM_RECV_ERRORS_LIMIT) {
+			c->key->is_valid_cw = 0;
+			memcpy(c->key->cw, invalid_cw, 16);
+		}
 		return 0;
 	}
 
@@ -173,6 +176,8 @@ READ:
 	// At first ts_keyset is not initialized
 	last_ts_keyset = c->key->ts_keyset;
 	if (c->key->is_valid_cw) {
+		c->ecm_recv_errors = 0;
+
 		gettimeofday(&c->key->ts_keyset, NULL);
 		c->key->ts = c->key->ts_keyset.tv_sec;
 		ts->cw_last_warn = c->key->ts;
@@ -287,9 +292,17 @@ static int camd35_send_emm(struct ts *ts, uint16_t ca_id, uint8_t *data, uint8_t
 		usleep(ts->packet_delay);
 
 	int ret = camd35_send_buf(ts, to_send);
-	if (ret <= 0) {
-		ts_LOGf("ERR | Error sending emm packet, reconnecting to camd.\n");
-		camd35_reconnect(ts);
+	if (ret < 0) {
+		c->emm_recv_errors++;
+		if (c->emm_recv_errors >= EMM_RECV_ERRORS_LIMIT) {
+			ts_LOGf("ERR | Error sending emm packet, reconnecting to camd.\n");
+			camd35_reconnect(ts);
+			c->emm_recv_errors = 0;
+		} else {
+			ts_LOGf("ERR | Error sending emm packet (nerrors: %d).\n", c->emm_recv_errors);
+		}
+	} else {
+			c->emm_recv_errors = 0;
 	}
 	return ret;
 }

data.h

@@ -55,6 +55,12 @@ struct key {
 #define CAMD35_HDR_LEN (20)
 #define CAMD35_BUF_LEN (4 + CAMD35_HDR_LEN + 256 + 16)
 
+// When this limit is reached invalid_cw flag is set.
+#define ECM_RECV_ERRORS_LIMIT 10
+
+// When this limit is reached camd_reconnect is called.
+#define EMM_RECV_ERRORS_LIMIT 10
+
 struct camd35 {
 	uint8_t			buf[CAMD35_BUF_LEN];
 
@@ -66,6 +72,9 @@ struct camd35 {
 	AES_KEY			aes_encrypt_key;
 	AES_KEY			aes_decrypt_key;
 
+	unsigned int	ecm_recv_errors; // Error counter, reset on successful send/recv
+	unsigned int	emm_recv_errors; // Error counter, reset on successful send/recv
+
 	uint32_t		auth_token;
 
 	struct key		*key;