SPINEL_PROP_SRP_CLIENT_START value

SRP Client Start Format: `b(6Sb)` - Write only Required capability: `SPINEL_CAP_SRP_CLIENT`. Writing to this property allows user to start or stop the SRP client operation with a given SRP server. Written value format is: `b` : TRUE to start the client, FALSE to stop the client. When used to start the SRP client, the following fields should also be included: `6` : SRP server IPv6 address. `U` : SRP server port number. `b` : Boolean to indicate whether or not to emit SRP client events (using `SPINEL_PROP_SRP_CLIENT_EVENT`).