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diff --git a/src/modbus.c b/src/modbus.c
index 68a28a3..4810cfe 100644
--- a/src/modbus.c
+++ b/src/modbus.c
@@ -208,6 +208,11 @@ static int send_msg(modbus_t *ctx, uint8_t *msg, int msg_length)
}
int modbus_send_raw_request(modbus_t *ctx, const uint8_t *raw_req, int raw_req_length)
+{
+ return modbus_send_raw_request_tid(ctx, raw_req, raw_req_length, 0);
+}
+
+int modbus_send_raw_request_tid(modbus_t *ctx, const uint8_t *raw_req, int raw_req_length, int tid)
{
sft_t sft;
uint8_t req[MAX_MESSAGE_LENGTH];
@@ -229,7 +234,7 @@ int modbus_send_raw_request(modbus_t *ctx, const uint8_t *raw_req, int raw_req_l
sft.slave = raw_req[0];
sft.function = raw_req[1];
/* The t_id is left to zero */
- sft.t_id = 0;
+ sft.t_id = tid;
/* This response function only set the header so it's convenient here */
req_length = ctx->backend->build_response_basis(&sft, req);
diff --git a/src/modbus.h b/src/modbus.h
index fbe20bc..8b3c675 100644
--- a/src/modbus.h
+++ b/src/modbus.h
@@ -228,6 +228,7 @@ MODBUS_API modbus_mapping_t* modbus_mapping_new(int nb_bits, int nb_input_bits,
MODBUS_API void modbus_mapping_free(modbus_mapping_t *mb_mapping);
MODBUS_API int modbus_send_raw_request(modbus_t *ctx, const uint8_t *raw_req, int raw_req_length);
+MODBUS_API int modbus_send_raw_request_tid(modbus_t *ctx, const uint8_t *raw_req, int raw_req_length, int tid);
MODBUS_API int modbus_receive(modbus_t *ctx, uint8_t *req);
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