Restructure and improve

main/ssh_client.h

@@ -0,0 +1,25 @@
+#ifndef SSH_CLIENT_H
+#define SSH_CLIENT_H
+
+#include <stdbool.h>
+
+/**
+ * Read the ATECC608B public key, format it as an SSH authorized_keys entry,
+ * and print it to the console.  Call this once at boot so the key can be
+ * added to the server's authorized_keys file.
+ *
+ * Output format:
+ *   ecdsa-sha2-nistp256 <base64-blob> keypitecc
+ */
+void ssh_print_public_key(void);
+
+/**
+ * Open a TCP connection to the configured SSH server, authenticate using the
+ * ATECC608B hardware key, execute @p cmd, log the output, and disconnect.
+ *
+ * @param cmd  Shell command string to run on the remote host.
+ * @return     true on success, false on any error.
+ */
+bool ssh_execute_command(const char *cmd);
+
+#endif /* SSH_CLIENT_H */