fm95 commit coming in a moment

src/ipc_client.c

@@ -27,6 +27,29 @@ void ipc_close(IPC_Client *client) {
 	client->fd = -1;
 }
 
+int ipc_send_streams(IPC_Client *client, uint8_t streams) {
+	if (client->fd < 0) return -1;
+
+	uint8_t msg[2];
+	msg[0] = 113;
+	msg[1] = streams;
+
+	ssize_t sent = send(client->fd, msg, sizeof(msg), 0);
+	if (sent != (ssize_t)sizeof(msg)) {
+		fprintf(stderr, "fm95 ipc: short/failed send\n");
+		return -1;
+	}
+
+	uint8_t reply;
+	if (recv(client->fd, &reply, 1, 0) <= 0) {
+		fprintf(stderr, "fm95 ipc: no reply / disconnected\n");
+		return -1;
+	}
+	if (reply == 1) fprintf(stderr, "fm95 rejected message (unknown opcode?)\n");
+
+	return 0;
+}
+
 // Pulls one group's worth of bits (BITS_PER_GROUP), differentially encodes,
 // packs 8-to-a-byte, sends as opcode 112 with the stream index.
 int ipc_send_bits(IPC_Client *client, RDSEncoder *enc, uint8_t stream) {

src/ipc_client.h

@@ -8,4 +8,5 @@ typedef struct {
 
 int ipc_connect(IPC_Client *client, const char *socket_path);
 void ipc_close(IPC_Client *client);
+int ipc_send_streams(IPC_Client *client, uint8_t streams);
 int ipc_send_bits(IPC_Client *client, RDSEncoder *enc, uint8_t stream);

src/rds95.c

@@ -188,11 +188,16 @@ int main(int argc, char **argv) {
 		IPC_Client client;
 		if (ipc_connect(&client, "/etc/fm95/ctl.socket") < 0) goto exit;
 
+		uint8_t sent_num = config.num_streams; ipc_send_streams(&client, sent_num);
+
 		while (!stop_rds) {
 			for (uint8_t s = 0; s < config.num_streams; s++) {
 				ipc_send_bits(&client, &rdsEncoder, s);
 			}
 			sleep_until_next_group(BITS_PER_GROUP, 1187.5);
+			if(config.num_streams != sent_num) {
+				sent_num = config.num_streams; ipc_send_streams(&client, sent_num);
+			}
 		}
 
 		ipc_close(&client);