One thing to keep in mind is that all recent firmwares expect the password to be MD5 hashed, not plain-text. For example, the default password is opendoor but if you are using the API or third-party plug-in, the HTTP API expect the password in MD5 form (the MD5 of opendoor is a6d82bced638de3def1e9bbb4983225c). If you send the plain-text password it will be rejected.