Extend firmware download handler to serve locally built custom firmware, too.

Just save it as `squeezelite-esp32-custom.bin` in the firmware update folder (LMS Cache/updates) and paste http://yourlms:9000/plugins/SqueezeESP32/firmware/custom.bin in the firmware URL box.

plugin/SqueezeESP32/FirmwareHelper.pm

@@ -16,6 +16,7 @@ use constant GITHUB_DOWNLOAD_URI => "https://github.com/sle118/squeezelite-esp32
 use constant ESP32_STATUS_URI => "http://%s/status.json";
 
 my $FW_DOWNLOAD_REGEX = qr|plugins/SqueezeESP32/firmware/([-a-z0-9-/.]+\.bin)$|i;
+my $FW_CUSTOM_REGEX = qr/^((?:squeezelite-esp32-)?custom\.bin)$/;
 my $FW_FILENAME_REGEX = qr/^squeezelite-esp32-.*\.bin(\.tmp)?$/;
 my $FW_TAG_REGEX = qr/\b(ESP32-A1S|SqueezeAmp|I2S-4MFlash)\.(16|32)\.(\d+)\.([-a-zA-Z0-9]+)\b/;
 
@@ -137,6 +138,22 @@ sub handleFirmwareDownload {
 		return Slim::Web::HTTP::closeHTTPSocket($httpClient);
 	}
 
+	if ($path =~ $FW_CUSTOM_REGEX) {
+		my $firmwareFile = catfile(scalar Slim::Utils::OSDetect::dirsFor('updates'), 'squeezelite-esp32-custom.bin');
+
+		if (! -f $firmwareFile) {
+			main::INFOLOG && $log->is_info && $log->info("Failed to find custom firmware build: $firmwareFile");
+			$response->code(404);
+			$httpClient->send_response($response);
+			return Slim::Web::HTTP::closeHTTPSocket($httpClient);
+		}
+
+		main::INFOLOG && $log->is_info && $log->info("Getting custom firmware build");
+
+		$response->code(200);
+		return Slim::Web::HTTP::sendStreamingFile($httpClient, $response, 'application/octet-stream', $firmwareFile, undef, 1);
+	}
+
 	main::INFOLOG && $log->is_info && $log->info("Requesting firmware from: $path");
 
 	downloadFirmwareFile(sub {

plugin/SqueezeESP32/Plugin.pm

@@ -37,12 +37,13 @@ $prefs->setChange(sub {
 sub initPlugin {
 	my $class = shift;
 
+	# enable the following to test the firmware downloading code without a SqueezeliteESP32 player
+	# require Plugins::SqueezeESP32::FirmwareHelper;
+	# Plugins::SqueezeESP32::FirmwareHelper::init();
+
 	if ( main::WEBUI ) {
 		require Plugins::SqueezeESP32::PlayerSettings;
 		Plugins::SqueezeESP32::PlayerSettings->new;
-
-		# require Plugins::SqueezeESP32::Settings;
-		# Plugins::SqueezeESP32::Settings->new;
 	}
 
 	$class->SUPER::initPlugin(@_);