Dont accept connections when application down

app/Classes/Protocol.php

@@ -124,6 +124,8 @@ abstract class Protocol
 	protected bool $originate;
 	/** Our comms details */
 
+	protected bool $down = FALSE;
+
 	private array $comms;
 
 	protected bool $force_queue = FALSE;
@@ -366,6 +368,9 @@ abstract class Protocol
 		// We are an IP node
 		$this->optionSet(self::O_TCP);
 		$this->client = $client;
+		// @todo This appears to be a bug in laravel? Need to call app()->isDownForMaintenance() twice?
+		app()->isDownForMaintenance();
+		$this->down = app()->isDownForMaintenance();
 
 		switch ($mo->name) {
 			case 'EMSI':

app/Classes/Protocol/Binkp.php

@@ -168,10 +168,21 @@ final class Binkp extends BaseProtocol
 	 *
 	 * @throws \Exception
 	 */
-	private function binkp_hs(): void
+	private function binkp_hs(): bool
 	{
 		Log::debug(sprintf('%s:+ Starting BINKP handshake',self::LOGKEY));
 
+		if (! $this->originate && $this->down) {
+			Log::info(sprintf('%s:! System down for maintenance',self::LOGKEY));
+
+			$this->msgs(self::BPM_BSY,'RETRY 0600: Down for maintenance, back soon...');
+
+			while ($this->tx_left || $this->mqueue->count())
+				$this->binkp_send();
+
+			return FALSE;
+		}
+
 		if (! $this->originate && $this->capGet(self::F_MD,self::O_WANT)) {
 			$random_key = random_bytes(8);
 			$this->md_challenge = md5($random_key,TRUE);
@@ -206,6 +217,8 @@ final class Binkp extends BaseProtocol
 
 			$this->msgs(self::BPM_ADR,$addresses->pluck('ftn')->join(' '));
 		}
+
+		return TRUE;
 	}
 
 	/**
@@ -1341,7 +1354,8 @@ final class Binkp extends BaseProtocol
 			return self::S_FAILURE;
 
 		$this->force_queue = $force_queue;
-		$this->binkp_hs();
+		if (! $this->binkp_hs())
+			return self::S_FAILURE;
 
 		while (TRUE) {
 			if ((! $this->sessionGet(self::SE_INIT))

app/Classes/Protocol/EMSI.php

@@ -930,6 +930,14 @@ final class EMSI extends BaseProtocol implements CRCInterface,ZmodemInterface
 
 		$this->client->rx_purge();
 		$this->client->tx_purge();
+
+		if ($this->down) {
+			Log::info(sprintf('%s:! System down for maintenance',self::LOGKEY));
+			$this->client->buffer_add(self::EMSI_NAK.'Sorry down for maintenance, call back again after a few minutes'.self::CR.self::CR);
+			$this->client->buffer_flush(5);
+			return -1;
+		}
+
 		$this->emsi_banner();
 
 		$t1 = $this->client->timer_set(self::EMSI_HSTIMEOUT);

config/app.php

@@ -42,6 +42,12 @@ return [
 
 	'debug' => (bool) env('APP_DEBUG', false),
 
+	// Where the maintenance mode file is stored when calling down
+	'maintenance' => [
+		'driver' => 'cache',
+		//'store' => 'memcached',
+	],
+
 	/*
 	|--------------------------------------------------------------------------
 	| Application URL