tests: os: use secondary antenna for revpi4

Change-type: patch
Signed-off-by: Ryan Cooke <ryan@balena.io>

tests/suites/os/suite.js

@@ -34,6 +34,14 @@ const supportsBootConfig = (deviceType) => {
 	);
 };
 
+const externalAnt = (deviceType) => {
+	return (
+		[
+			'revpi-connect-4'
+		]
+	).includes(deviceType)
+}
+
 const flasherConfig = (deviceType) => {
 	return (
 		[
@@ -69,6 +77,30 @@ const enableSerialConsole = async (imagePath) => {
 	}
 };
 
+// For use with device types (e.g revpi connect 4) where an external antenna needs to be configured throuhg config.txt to work
+const enableExternalAntenna  = async (imagePath) => {
+	const bootConfig = await imagefs.interact(imagePath, 1, async (_fs) => {
+		return util
+			.promisify(_fs.readFile)('/config.txt')
+			.catch((err) => {
+				return undefined;
+			});
+	});
+
+	if (bootConfig) {
+		await imagefs.interact(imagePath, 1, async (_fs) => {
+			const value = 'dtparam=ant2';
+
+			console.log(`Setting ${value} in config.txt...`);
+
+			await util.promisify(_fs.writeFile)(
+				'/config.txt',
+				bootConfig.toString().concat(`\n\n${value}\n\n`),
+			);
+		});
+	}
+};
+
 // For device types that support it, this enables skipping boot switch selection, to simplify the automated flashing
 const setFlasher = async(imagePath) => {
 	await imagefs.interact(imagePath, 1, async (_fs) => {
@@ -317,6 +349,10 @@ module.exports = {
 			await setFlasher(this.os.image.path);
 		}
 
+		if(externalAnt(this.suite.deviceType.slug)){
+			await enableExternalAntenna(this.os.image.path);
+		}
+
 		if (this.suite.options?.balena?.apiKey) {
 			// Authenticating balenaSDK
 			await this.context