Decode payload to utf8 string

src/lib/waku_message.spec.ts

@@ -14,4 +14,15 @@ describe('Waku Message', function () {
       })
     );
   });
+
+  it('Payload to utf-8', function () {
+    fc.assert(
+      fc.property(fc.string(), (s) => {
+        const msg = Message.fromUtf8String(s);
+        const utf8 = msg.utf8Payload();
+
+        return utf8 === s;
+      })
+    );
+  });
 });

src/lib/waku_message.ts

@@ -37,6 +37,18 @@ export class Message {
     }).finish();
   }
 
+  utf8Payload(): string {
+    if (!this.payload) {
+      return '';
+    }
+
+    return Array.from(this.payload)
+      .map((char) => {
+        return String.fromCharCode(char);
+      })
+      .join('');
+  }
+
   // Purely for tests purposes.
   // We do consider protobuf field when checking equality
   // As the content is held by the other fields.