1 files changed, 59 insertions, 0 deletions
diff --git a/include/hybbx/traffic.h b/include/hybbx/traffic.h
new file mode 100644
index 0000000..8d06cf3
--- /dev/null
+++ b/include/hybbx/traffic.h
@@ -0,0 +1,59 @@
+#ifndef HYBBX_TRAFFIC_H
+#define HYBBX_TRAFFIC_H
+
+#include "hybbx/types.h"
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct hybbx_config;
+struct hybbx_session;
+
+/** Host link speed HyBBX is optimized for (8N1, ~1 byte per 10 bit times). */
+#define HYBBX_BAUD2400 2400u
+
+/** Default terminal width (columns). */
+#define HYBBX_LINE_WIDTH 80u
+
+/** Maximum configurable `line_width` in INI. */
+#define HYBBX_LINE_WIDTH_MAX 132u
+
+/** Maximum user input line (commands / chat). */
+#define HYBBX_LINE_MAX 80u
+
+/** Typical AX.25 UI payload ceiling used for outbound chunk sizing. */
+#define HYBBX_AX25_PAYLOAD_MAX 256u
+
+typedef struct hybbx_traffic_config {
+    unsigned baud;
+    unsigned line_width;
+    int pace_output;
+    int ansi;
+    int input_echo;
+} hybbx_traffic_config_t;
+
+void hybbx_traffic_config_defaults(hybbx_traffic_config_t *cfg);
+void hybbx_traffic_config_apply(const struct hybbx_config *config);
+const hybbx_traffic_config_t *hybbx_traffic_config_get(void);
+
+/**
+ * Microseconds to wait after one 8N1 byte at @p baud (0 when pacing is off).
+ */
+unsigned hybbx_traffic_byte_delay_us(unsigned baud);
+
+/**
+ * Emit @p data to @p session with plain-ASCII policy, column wrap, and pacing.
+ * @p out_col is updated (wrap position on the current output line).
+ */
+hybbx_result_t hybbx_traffic_emit(struct hybbx_session *session,
+                                  unsigned *out_col,
+                                  const char *data, size_t len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HYBBX_TRAFFIC_H */