Improve error-handling of chain ID when parsing APDUs

src/network.c

@@ -144,3 +144,15 @@ const char *get_displayable_ticker(const uint64_t *chain_id) {
     }
     return ticker;
 }
+
+/**
+ * Checks wether the app can support the given chain ID
+ *
+ * - If the given chain ID is the same as the app's one
+ * - If both chain IDs are present in the array of Ethereum-compatible networks
+ */
+bool app_compatible_with_chain_id(const uint64_t *chain_id) {
+    return ((chainConfig->chainId == *chain_id) ||
+            (chain_is_ethereum_compatible(&chainConfig->chainId) &&
+             chain_is_ethereum_compatible(chain_id)));
+}

src/network.h

@@ -3,10 +3,16 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+#define UNSUPPORTED_CHAIN_ID_MSG(id)                                              \
+    do {                                                                          \
+        PRINTF("Unsupported chain ID: %u (app: %u)\n", id, chainConfig->chainId); \
+    } while (0)
+
 const char *get_network_name_from_chain_id(const uint64_t *chain_id);
 const char *get_network_ticker_from_chain_id(const uint64_t *chain_id);
 
 bool chain_is_ethereum_compatible(const uint64_t *chain_id);
+bool app_compatible_with_chain_id(const uint64_t *chain_id);
 
 uint64_t get_tx_chain_id(void);