device: allow loading identities from a file (instead of argument)

trezor_agent/device/keepkey.py

@@ -11,15 +11,7 @@ class KeepKey(trezor.Trezor):
 
     required_version = '>=1.0.4'
 
-    def connect(self):
-        """No support for other than NIST256P elliptic curves."""
-        if self.curve_name not in {formats.CURVE_NIST256}:
-            fmt = 'KeepKey does not support {} curve'
-            raise interface.NotFoundError(fmt.format(self.curve_name))
-
-        return trezor.Trezor.connect(self)
-
-    def ecdh(self, pubkey):
+    def ecdh(self, identity, pubkey):
         """No support for ECDH in KeepKey firmware."""
         msg = 'KeepKey does not support ECDH'
         raise interface.NotFoundError(msg)