diff --git a/libpldm/requester/pldm.c b/libpldm/requester/pldm.c
new file mode 100644
index 0000000..932f55e
--- /dev/null
+++ b/libpldm/requester/pldm.c
@@ -0,0 +1,188 @@
+#include "pldm.h"
+#include "base.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+const uint8_t MCTP_MSG_TYPE_PLDM = 1;
+
+pldm_requester_rc_t pldm_open()
+{
+	int fd = -1;
+	int rc = -1;
+
+	fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+	if (-1 == fd) {
+		return fd;
+	}
+
+	const char path[] = "\0mctp-mux";
+	struct sockaddr_un addr;
+	addr.sun_family = AF_UNIX;
+	memcpy(addr.sun_path, path, sizeof(path) - 1);
+	rc = connect(fd, (struct sockaddr *)&addr,
+		     sizeof(path) + sizeof(addr.sun_family) - 1);
+	if (-1 == rc) {
+		return PLDM_REQUESTER_OPEN_FAIL;
+	}
+	rc = write(fd, &MCTP_MSG_TYPE_PLDM, sizeof(MCTP_MSG_TYPE_PLDM));
+	if (-1 == rc) {
+		return PLDM_REQUESTER_OPEN_FAIL;
+	}
+
+	return fd;
+}
+
+/**
+ * @brief Read MCTP socket. If there's data available, return success only if
+ *        data is a PLDM message.
+ *
+ * @param[in] eid - destination MCTP eid
+ * @param[in] mctp_fd - MCTP socket fd
+ * @param[out] pldm_resp_msg - *pldm_resp_msg will point to PLDM msg,
+ *             this function allocates memory, caller to free(*pldm_resp_msg) on
+ *             success.
+ * @param[out] resp_msg_len - caller owned pointer that will be made point to
+ *             the size of the PLDM msg.
+ *
+ * @return pldm_requester_rc_t (errno may be set). failure is returned even
+ *         when data was read, but wasn't a PLDM response message
+ */
+static pldm_requester_rc_t mctp_recv(mctp_eid_t eid, int mctp_fd,
+				     uint8_t **pldm_resp_msg,
+				     size_t *resp_msg_len)
+{
+	ssize_t min_len = sizeof(eid) + sizeof(MCTP_MSG_TYPE_PLDM) +
+			  sizeof(struct pldm_msg_hdr);
+	ssize_t length = recv(mctp_fd, NULL, 0, MSG_PEEK | MSG_TRUNC);
+	if (length <= 0) {
+		return PLDM_REQUESTER_RECV_FAIL;
+	} else if (length < min_len) {
+		/* read and discard */
+		uint8_t buf[length];
+		recv(mctp_fd, buf, length, 0);
+		return PLDM_REQUESTER_INVALID_RECV_LEN;
+	} else {
+		struct iovec iov[2];
+		size_t mctp_prefix_len =
+		    sizeof(eid) + sizeof(MCTP_MSG_TYPE_PLDM);
+		uint8_t mctp_prefix[mctp_prefix_len];
+		size_t pldm_len = length - mctp_prefix_len;
+		iov[0].iov_len = mctp_prefix_len;
+		iov[0].iov_base = mctp_prefix;
+		*pldm_resp_msg = malloc(pldm_len);
+		iov[1].iov_len = pldm_len;
+		iov[1].iov_base = *pldm_resp_msg;
+		struct msghdr msg = {0};
+		msg.msg_iov = iov;
+		msg.msg_iovlen = sizeof(iov) / sizeof(iov[0]);
+		ssize_t bytes = recvmsg(mctp_fd, &msg, 0);
+		if (length != bytes) {
+			free(*pldm_resp_msg);
+			return PLDM_REQUESTER_INVALID_RECV_LEN;
+		}
+		if ((mctp_prefix[0] != eid) ||
+		    (mctp_prefix[1] != MCTP_MSG_TYPE_PLDM)) {
+			free(*pldm_resp_msg);
+			return PLDM_REQUESTER_NOT_PLDM_MSG;
+		}
+		*resp_msg_len = pldm_len;
+		return PLDM_REQUESTER_SUCCESS;
+	}
+}
+
+pldm_requester_rc_t pldm_recv_any(mctp_eid_t eid, int mctp_fd,
+				  uint8_t **pldm_resp_msg, size_t *resp_msg_len)
+{
+	pldm_requester_rc_t rc =
+	    mctp_recv(eid, mctp_fd, pldm_resp_msg, resp_msg_len);
+	if (rc != PLDM_REQUESTER_SUCCESS) {
+		return rc;
+	}
+
+	struct pldm_msg_hdr *hdr = (struct pldm_msg_hdr *)(*pldm_resp_msg);
+	if (hdr->request != PLDM_RESPONSE) {
+		free(*pldm_resp_msg);
+		return PLDM_REQUESTER_NOT_RESP_MSG;
+	}
+
+	uint8_t pldm_rc = 0;
+	if (*resp_msg_len < (sizeof(struct pldm_msg_hdr) + sizeof(pldm_rc))) {
+		free(*pldm_resp_msg);
+		return PLDM_REQUESTER_RESP_MSG_TOO_SMALL;
+	}
+
+	return PLDM_REQUESTER_SUCCESS;
+}
+
+pldm_requester_rc_t pldm_recv(mctp_eid_t eid, int mctp_fd, uint8_t instance_id,
+			      uint8_t **pldm_resp_msg, size_t *resp_msg_len)
+{
+	pldm_requester_rc_t rc =
+	    pldm_recv_any(eid, mctp_fd, pldm_resp_msg, resp_msg_len);
+	if (rc != PLDM_REQUESTER_SUCCESS) {
+		return rc;
+	}
+
+	struct pldm_msg_hdr *hdr = (struct pldm_msg_hdr *)(*pldm_resp_msg);
+	if (hdr->instance_id != instance_id) {
+		free(*pldm_resp_msg);
+		return PLDM_REQUESTER_INSTANCE_ID_MISMATCH;
+	}
+
+	return PLDM_REQUESTER_SUCCESS;
+}
+
+pldm_requester_rc_t pldm_send_recv(mctp_eid_t eid, int mctp_fd,
+				   const uint8_t *pldm_req_msg,
+				   size_t req_msg_len, uint8_t **pldm_resp_msg,
+				   size_t *resp_msg_len)
+{
+	struct pldm_msg_hdr *hdr = (struct pldm_msg_hdr *)pldm_req_msg;
+	if ((hdr->request != PLDM_REQUEST) &&
+	    (hdr->request != PLDM_ASYNC_REQUEST_NOTIFY)) {
+		return PLDM_REQUESTER_NOT_REQ_MSG;
+	}
+
+	pldm_requester_rc_t rc =
+	    pldm_send(eid, mctp_fd, pldm_req_msg, req_msg_len);
+	if (rc != PLDM_REQUESTER_SUCCESS) {
+		return rc;
+	}
+
+	while (1) {
+		rc = pldm_recv(eid, mctp_fd, hdr->instance_id, pldm_resp_msg,
+			       resp_msg_len);
+		if (rc == PLDM_REQUESTER_SUCCESS) {
+			break;
+		}
+	}
+
+	return rc;
+}
+
+pldm_requester_rc_t pldm_send(mctp_eid_t eid, int mctp_fd,
+			      const uint8_t *pldm_req_msg, size_t req_msg_len)
+{
+	uint8_t hdr[2] = {eid, MCTP_MSG_TYPE_PLDM};
+
+	struct iovec iov[2];
+	iov[0].iov_base = hdr;
+	iov[0].iov_len = sizeof(hdr);
+	iov[1].iov_base = (uint8_t *)pldm_req_msg;
+	iov[1].iov_len = req_msg_len;
+
+	struct msghdr msg = {0};
+	msg.msg_iov = iov;
+	msg.msg_iovlen = sizeof(iov) / sizeof(iov[0]);
+
+	ssize_t rc = sendmsg(mctp_fd, &msg, 0);
+	if (rc == -1) {
+		return PLDM_REQUESTER_SEND_FAIL;
+	}
+	return PLDM_REQUESTER_SUCCESS;
+}