diff --git a/app/Classes/Protocol.php b/app/Classes/Protocol.php
index bbc3ee0..bdd953e 100644
--- a/app/Classes/Protocol.php
+++ b/app/Classes/Protocol.php
@@ -14,7 +14,7 @@ use App\Models\{Address,Setup,System,SystemLog};
 abstract class Protocol
 {
 	// Enable extra debugging
-	protected bool $DEBUG = FALSE;
+	protected const DEBUG = FALSE;
 
 	private const LOGKEY = 'P--';
 
diff --git a/app/Classes/Protocol/Binkp.php b/app/Classes/Protocol/Binkp.php
index d256c26..be6720c 100644
--- a/app/Classes/Protocol/Binkp.php
+++ b/app/Classes/Protocol/Binkp.php
@@ -362,7 +362,7 @@ final class Binkp extends BaseProtocol
 			} catch (SocketException $e) {
 				if ($e->getCode() === 11) {
 					// @todo We maybe should count these and abort if there are too many?
-					if ($this->DEBUG)
+					if (static::DEBUG)
 						Log::debug(sprintf('%s:- Got a socket EAGAIN',self::LOGKEY));
 
 					return TRUE;
@@ -424,7 +424,7 @@ final class Binkp extends BaseProtocol
 						return TRUE;
 					}
 
-					if ($this->DEBUG)
+					if (static::DEBUG)
 						Log::debug(sprintf('%s: - binkp_recv BUFFER [%d]',self::LOGKEY,strlen($this->rx_buf)));
 
 					$msg = ord(substr($this->rx_buf,0,1));
@@ -534,7 +534,7 @@ final class Binkp extends BaseProtocol
 			$rc = TRUE;
 		}
 
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s:= binkp_recv [%d]',self::LOGKEY,$rc));
 
 		return $rc;
diff --git a/app/Classes/Protocol/EMSI.php b/app/Classes/Protocol/EMSI.php
index 8ab6a10..972e6a6 100644
--- a/app/Classes/Protocol/EMSI.php
+++ b/app/Classes/Protocol/EMSI.php
@@ -277,7 +277,7 @@ final class EMSI extends BaseProtocol implements CRCInterface,ZmodemInterface
 	 */
 	private function emsi_parsedat(string $str): int
 	{
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s:+ emsi_parsedat',self::LOGKEY));
 
 		$l = 0;
@@ -826,7 +826,7 @@ final class EMSI extends BaseProtocol implements CRCInterface,ZmodemInterface
 	 */
 	protected function protocol_init(): int
 	{
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s:+ Starting EMSI Protocol INIT',self::LOGKEY));
 
 		$got = 0;
@@ -852,7 +852,7 @@ final class EMSI extends BaseProtocol implements CRCInterface,ZmodemInterface
 			$t2 = $this->client->timer_set(self::EMSI_RESEND_TO);
 			while (TRUE) {
 				$ch = $this->client->read_ch(max( 1,min($this->client->timer_rest($t1),$this->client->timer_rest($t2))));
-				if ($this->DEBUG)
+				if (static::DEBUG)
 					Log::debug(sprintf('%s:- Got [%x] (%c)',self::LOGKEY,$ch,$ch));
 
 				if (($ch != self::TIMEOUT) && ($ch < 0))
@@ -918,7 +918,7 @@ final class EMSI extends BaseProtocol implements CRCInterface,ZmodemInterface
 
 		while (! $this->client->timer_expired($t1)) {
 			$ch = $this->client->read_ch(max( 1,min($this->client->timer_rest($t1),$this->client->timer_rest($t2))));
-			if ($this->DEBUG)
+			if (static::DEBUG)
 				Log::debug(sprintf('%s:- Got [%x] (%c)',self::LOGKEY,$ch,$ch));
 
 			if (($ch != self::TIMEOUT) && ($ch < 0))
diff --git a/app/Classes/Protocol/Zmodem.php b/app/Classes/Protocol/Zmodem.php
index 60d1688..394a0a9 100644
--- a/app/Classes/Protocol/Zmodem.php
+++ b/app/Classes/Protocol/Zmodem.php
@@ -877,12 +877,12 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 				case self::XOFF:
 				case self::XON|0x80:
 				case self::XOFF|0x80:
-					if ($this->DEBUG)
+					if (static::DEBUG)
 						Log::debug(sprintf('%s: - ls_zdonereceiver XON/XOFF, skip it',self::LOGKEY));
 					break;
 
 				case self::ZPAD:
-					if ($this->DEBUG)
+					if (static::DEBUG)
 						Log::debug(sprintf('%s: - ls_zdonereceiver ZPAD',self::LOGKEY));
 
 					if (($rc=$this->ls_zrecvhdr($this->ls_rxHdr,$this->ls_HeaderTimeout)) < 0)
@@ -1085,7 +1085,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 	 */
 	private function ls_zrecvdata16(string &$data,int &$len,int $timeout): int
 	{
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s:+ ls_zrecvdata16',self::LOGKEY),['d'=>$data]);
 
 		$got = 0;							/* Bytes total got */
@@ -1094,7 +1094,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 		$rcvdata = 1;						/* Data is being received NOW (not CRC) */
 
 		while ($rcvdata && (($c = $this->ls_readzdle($timeout)) >= 0)) {
-			if ($this->DEBUG)
+			if (static::DEBUG)
 				Log::debug(sprintf('%s: - ls_zrecvdata16 got [%x] (%c)',self::LOGKEY,$c,($c<31 ? 32 : $c)),['c'=>serialize($c)]);
 
 			if ($c < 256) {
@@ -1140,7 +1140,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 
 		$incrc = crc16($data.chr($frametype));
 
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s: - ls_zrecvdata16 CRC%d got %08x - calculated %08x',self::LOGKEY,16,$incrc,$crc));
 
 		if ($incrc != $crc)
@@ -1148,7 +1148,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 
 		$len = $got;
 
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s:= ls_zrecvdata16 - frametype [%d]',self::LOGKEY,$frametype));
 
 		return $frametype;
@@ -1164,7 +1164,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 	 */
 	private function ls_zrecvdata32(string &$data,int &$len,int $timeout): int
 	{
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s:+ ls_zrecvdata32',self::LOGKEY),['d'=>$data]);
 
 		$got = 0;							/* Bytes total got */
@@ -1173,7 +1173,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 		$rcvdata = 1;						/* Data is being received NOW (not CRC) */
 
 		while ($rcvdata && (($c=$this->ls_readzdle($timeout)) >= 0)) {
-			if ($this->DEBUG)
+			if (static::DEBUG)
 				Log::debug(sprintf('%s: - ls_zrecvdata32 got [%x] (%c)',self::LOGKEY,$c,($c<31 ? 32 : $c)),['c'=>serialize($c)]);
 
 			if ($c < 256) {
@@ -1225,7 +1225,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 		$crc |= ($c << 0x18);
 
 		$incrc = crc32($data.chr($frametype));
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s: - ls_zrecvdata32 CRC%d got %08x - calculated %08x',self::LOGKEY,32,$incrc,$crc));
 
 		if ($incrc != $crc)
@@ -1233,7 +1233,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 
 		$len = $got;
 
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s:= ls_zrecvdata32 - frametype [%d]',self::LOGKEY,$frametype));
 
 		return $frametype;
@@ -1550,7 +1550,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 	 */
 	private function ls_zrecvhdr(array &$hdr,int $timeout): int
 	{
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s:+ Receive header with [%d] timeout',self::LOGKEY,$timeout));
 
 		$state = self::rhInit;
@@ -1567,7 +1567,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 		$c = -1;
 
 		if ($state === self::rhInit) {
-			if ($this->DEBUG)
+			if (static::DEBUG)
 				Log::debug(sprintf('%s:- ls_zrecvhdr Init State',self::LOGKEY));
 
 			$frametype = self::ERROR;
@@ -1581,7 +1581,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 		}
 
 		while ($rc=$this->client->hasData($timeout)) {
-			if ($this->DEBUG)
+			if (static::DEBUG)
 				Log::debug(sprintf('%s:- ls_zrecvhdr hasData - readmode [%d], garbage chars [%d], state [%d]',self::LOGKEY,$readmode,$garbage,$state));
 
 			switch ($readmode) {
@@ -1602,7 +1602,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 					break;
 			}
 
-			if ($this->DEBUG)
+			if (static::DEBUG)
 				Log::debug(sprintf('%s:  - ls_zrecvhdr [%x] (%c)',self::LOGKEY,$c,$c));
 
 			/* Here is error */
@@ -1717,7 +1717,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 					break;
 
 				case self::rhBYTE:
-					if ($this->DEBUG)
+					if (static::DEBUG)
 						Log::debug(sprintf('%s:  / ls_zrecvhdr [%02x] (%d)',self::LOGKEY,$c,$got));
 
 					$hdr[$got] = $c;
@@ -1730,7 +1730,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 					break;
 
 				case self::rhCRC:
-					if ($this->DEBUG)
+					if (static::DEBUG)
 						Log::debug(sprintf('%s:  %% ls_zrecvhdr [%02x] (%d|%d)',self::LOGKEY,$c,$crcgot+1,$got));
 
 					if ($crcl === 2) {
@@ -1763,7 +1763,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 							$this->ls_Protocol |= self::LSZ_OPTCRC32;
 						}
 
-						if ($this->DEBUG)
+						if (static::DEBUG)
 							Log::debug(sprintf('%s:- ls_zrecvhdr CRC%d got [%08x] - calculated [%08x]',self::LOGKEY,(($crcl==2) ? 16 : 32),$incrc,$crc));
 
 						if ($incrc != $crc)
@@ -1788,7 +1788,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 						/* we need LF after <CR> */
 						case self::CR:
 						case self::CR|0x80:
-							if ($this->DEBUG)
+							if (static::DEBUG)
 								Log::debug(sprintf('%s:? ls_zrecvhdr rhCR, ignoring any remaining chars [%x]',self::LOGKEY,$c));
 
 							/* At this point, most implementations ignore checking for the remaining chars */
@@ -1802,7 +1802,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 
 						case self::XON:
 						case self::XON|0x80:
-							if ($this->DEBUG)
+							if (static::DEBUG)
 								Log::debug(sprintf('%s:? ls_zrecvhdr rhCR, got XON without CR/LF [%x]',self::LOGKEY,$c));
 
 							return $frametype;
@@ -1833,7 +1833,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 				case self::rhXON:
 					$state = self::rhInit;
 
-					if ($this->DEBUG)
+					if (static::DEBUG)
 						Log::debug(sprintf('%s: - ls_zrecvhdr rhXON',self::LOGKEY));
 
 					switch ($c) {
@@ -2004,11 +2004,11 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 	 */
 	private function ls_zsenddata(string $data,int $frame): int
 	{
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s:+ ls_zsenddata [%d] (%d)',self::LOGKEY,strlen($data),$frame));
 
 		if ($this->ls_Protocol&self::LSZ_OPTCRC32) {
-			if ($this->DEBUG)
+			if (static::DEBUG)
 				Log::debug(sprintf('%s: - ls_zsenddata CRC32',self::LOGKEY));
 
 			for ($n=0;$n<strlen($data);$n++)
@@ -2037,7 +2037,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 			$crc >>= 8;
 
 		} else {
-			if ($this->DEBUG)
+			if (static::DEBUG)
 				Log::debug(sprintf('%s: - ls_zsenddata CRC16',self::LOGKEY));
 
 			for ($n=0;$n<strlen($data);$n++) {
@@ -2255,7 +2255,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 					case self::ZACK:
 						$this->ls_txLastACK = $this->ls_fetchlong($this->ls_rxHdr);
 
-						if ($this->DEBUG)
+						if (static::DEBUG)
 							Log::debug(sprintf('%s: - ls_zsendfile ZACK',self::LOGKEY),['ls_rxHdr'=>$this->ls_rxHdr,'ls_txLastACK'=>$this->ls_txLastACK,'ls_rxHdr'=>$this->ls_rxHdr]);
 
 						break;
@@ -2522,7 +2522,7 @@ final class Zmodem extends Protocol implements CRCInterface,ZmodemInterface
 	/* Send HEX header. Use CRC16, send var. len. if could */
 	private function ls_zsendhhdr(int $frametype,array $hdr): int
 	{
-		if ($this->DEBUG)
+		if (static::DEBUG)
 			Log::debug(sprintf('%s:+ ls_zsendhhdr',self::LOGKEY));
 
 		/* Send **<DLE> */
diff --git a/app/Classes/Sock/SocketClient.php b/app/Classes/Sock/SocketClient.php
index 288a5df..dfb6204 100644
--- a/app/Classes/Sock/SocketClient.php
+++ b/app/Classes/Sock/SocketClient.php
@@ -17,7 +17,7 @@ final class SocketClient {
 	private const LOGKEY = 'SC-';
 
 	// For deep debugging
-	private bool $DEBUG = TRUE;
+	private const DEBUG = FALSE;
 
 	private \Socket $connection;
 	private string $address_local = '';
@@ -162,11 +162,11 @@ final class SocketClient {
 		$num_bytes = strlen($data);
 
 		while ($num_bytes) {
-			if ($this->DEBUG)
+			if (self::DEBUG)
 				Log::debug(sprintf('%s:- To add [%d] to the TX buffer',self::LOGKEY,$num_bytes));
 
 			if ($num_bytes > $this->tx_free) {
-				if ($this->DEBUG)
+				if (self::DEBUG)
 					Log::debug(sprintf('%s:- TX buffer will be too full, draining...',self::LOGKEY));
 
 				do {
@@ -185,7 +185,7 @@ final class SocketClient {
 			}
 		}
 
-		if ($this->DEBUG)
+		if (self::DEBUG)
 			Log::debug(sprintf('%s:= TX buffer has [%d] space left',self::LOGKEY,$this->tx_free));
 	}
 
@@ -198,7 +198,7 @@ final class SocketClient {
 	 */
 	public function buffer_flush(int $timeout): int
 	{
-		if ($this->DEBUG)
+		if (self::DEBUG)
 			Log::debug(sprintf('%s:+ Emptying TX buffer with [%d] chars, and timeout [%d]',self::LOGKEY,strlen($this->tx_buf),$timeout));
 
 		$tm = $this->timer_set($timeout);
@@ -208,12 +208,12 @@ final class SocketClient {
 			$tv = $this->timer_rest($tm);
 
 			if (($rc=$this->canSend($tv)) > 0) {
-				if ($this->DEBUG)
+				if (self::DEBUG)
 					Log::debug(sprintf('%s:- Chars to send [%d]',self::LOGKEY,strlen($this->tx_buf)));
 
 				$sent = $this->send(substr($this->tx_buf,0,self::TX_SIZE),0);
 
-				if ($this->DEBUG)
+				if (self::DEBUG)
 					Log::debug(sprintf('%s:- Sent [%d] chars [%s]',self::LOGKEY,$sent,Str::limit($this->tx_buf,15)));
 
 				$this->tx_buf = substr($this->tx_buf,$sent);
@@ -291,7 +291,7 @@ final class SocketClient {
 	{
 		// We have data in our buffer
 		if ($this->rx_left >= $len) {
-			if ($this->DEBUG)
+			if (self::DEBUG)
 				Log::debug(sprintf('%s:- Returning [%d] chars from the RX buffer',self::LOGKEY,$len));
 
 			$result = substr($this->rx_buf,0,$len);
@@ -329,7 +329,7 @@ final class SocketClient {
 		if ($recv === FALSE) {
 			// If we have something in the buffer, we'll send it
 			if ($this->rx_left) {
-				if ($this->DEBUG)
+				if (self::DEBUG)
 					Log::debug(sprintf('%s:- Network read return an error, returning final [%d] chars from the RX buffer',self::LOGKEY,strlen($this->rx_buf)));
 
 				$result = $this->rx_buf;
@@ -355,7 +355,7 @@ final class SocketClient {
 
 		$this->rx_buf .= $buf;
 
-		if ($this->DEBUG)
+		if (self::DEBUG)
 			Log::debug(sprintf('%s:- Added [%d] chars to the RX buffer',self::LOGKEY,strlen($buf)),['rx_buf'=>hex_dump($this->rx_buf)]);
 
 		// Loop again and return the data, now that it is in the RX buffer
@@ -384,7 +384,7 @@ final class SocketClient {
 
 	public function rx_purge(): void
 	{
-		if ($this->DEBUG)
+		if (self::DEBUG)
 			Log::debug(sprintf('%s:+ Discarding [%d] chars from the RX buffer',self::LOGKEY,strlen($this->tx_buf)));
 
 		$this->rx_buf = '';
@@ -395,7 +395,7 @@ final class SocketClient {
 	 */
 	public function tx_purge(): void
 	{
-		if ($this->DEBUG)
+		if (self::DEBUG)
 			Log::debug(sprintf('%s:+ Discarding [%d] chars from the TX buffer',self::LOGKEY,strlen($this->tx_buf)));
 
 		$this->tx_buf = '';
@@ -414,7 +414,7 @@ final class SocketClient {
 		if ($timeout AND (! $rc=$this->canSend($timeout)))
 			return $rc;
 
-		if ($this->DEBUG)
+		if (self::DEBUG)
 			Log::debug(sprintf('%s:- Sending [%d] chars [%s]',self::LOGKEY,strlen($message),Str::limit($message,15)));
 
 		switch ($this->type) {
@@ -446,7 +446,7 @@ final class SocketClient {
 		if ($rc === FALSE)
 			throw new \Exception('Socket Error: '.socket_strerror(socket_last_error()));
 
-		if ($this->DEBUG)
+		if (self::DEBUG)
 			Log::debug(sprintf('%s:= Socket select returned [%d] with timeout (%d)',self::LOGKEY,$rc,$timeout),['read'=>$read,'write'=>$write,'except'=>$except]);
 
 		return $rc;
@@ -480,7 +480,7 @@ final class SocketClient {
 	public function ttySelect(bool $read,bool $write, int $timeout): int
 	{
 		if ($this->rx_left) {
-			if ($this->DEBUG)
+			if (self::DEBUG)
 				Log::debug(sprintf('%s:= We still have [%d] chars in the RX buffer.',self::LOGKEY,$this->rx_left));
 
 			return 1;