send Testnet BTC coin definition - proof of concept

core/src/apps/bitcoin/keychain.py

@@ -5,7 +5,7 @@ from typing import TYPE_CHECKING
 from trezor import wire
 from trezor.enums import InputScriptType
 
-from apps.common.coininfo import by_name
+from apps.common.coininfo import by_name, get_coin_from_host
 from apps.common.keychain import get_keychain
 from apps.common.paths import PATTERN_BIP44, PathSchema
 
@@ -229,7 +229,8 @@ async def get_coin_by_name(ctx: wire.Context, coin_name: str | None) -> CoinInfo
         coin_name = "Bitcoin"
 
     try:
-        return by_name(coin_name)
+        return await get_coin_from_host(ctx, coin_name)
+        # return by_name(coin_name)
     except ValueError:
         raise wire.DataError("Unsupported coin type")
 

python/src/trezorlib/btc.py

@@ -302,8 +302,12 @@ def sign_tx(
     res = client.call(signtx)
 
     # Check whether device asked for coin info
-    if isinstance(res, messages.CoinInfoNeeded):
-        res = client.call(coininfo.by_name(coin_name))
+    if isinstance(res, messages.CoinInfoRequest):
+        res = client.call(messages.CoinInfoAck(
+            signature=bytes.fromhex("03b4c4106c825c404acab14f97dd08ffb07ec341e6e322820e52b5fcf305b0e7646b54d3f1945da7aa4b385ee5d54120f7359b602e910e2076ec0b4a0810ad04"),
+            encoded_coin=bytes.fromhex("0a07546573746e65741204544553541808206f28c4013080ade2043a18426974636f696e205369676e6564204d6573736167653a0a40cf8fd62148e2a4a92250f6b9fc2258ef938a126083a9dd126a0274627801800101880101980100a00100a80100b20109736563703235366b31b80100c00100c80100"),
+            code=messages.CoinInfoAckType.Bitcoin,
+        ))
 
     # Prepare structure for signatures
     signatures: List[Optional[bytes]] = [None] * len(inputs)