sequence! { procedure, context,
    // ACL Connection Established
    Lower Tester -> IUT: EncryptionModeReq {
        transaction_id: 0,
        encryption_mode: 0x01,
    }
    IUT ->Lower Tester: Accepted {
        transaction_id: 0,
        accepted_opcode: Opcode::EncryptionModeReq,
    }
    Lower Tester -> IUT: EncryptionKeySizeReq {
        transaction_id: 0,
        key_size: 0x10,
    }
    IUT -> Lower Tester: Accepted {
        transaction_id: 0,
        accepted_opcode: Opcode::EncryptionKeySizeReq,
    }
    Lower Tester -> IUT: StartEncryptionReq {
        transaction_id: 0,
        random_number: [0; 16],
    }
    IUT -> Lower Tester: Accepted {
        transaction_id: 0,
        accepted_opcode: Opcode::StartEncryptionReq,
    }
    IUT -> Upper Tester: EncryptionChange {
        status: ErrorCode::Success,
        connection_handle: context.peer_handle(),
        encryption_enabled: EncryptionEnabled::On,
    }
}