James Tavares has uploaded this change for review.

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simtrace2-tool: hack: kick the comms by sending a fake message

This is a workaround until the root cause of the communications failure
between simtrace2-tool and simtrace2 firmware is identified. Additional
details provided on simtrace mailing list.

Change-Id: I40fa06bee5d8194516497e16597e069124ddf0fb
---
M host/include/osmocom/simtrace2/simtrace2_api.h
M host/lib/simtrace2_api.c
M host/src/simtrace2-tool.c
3 files changed, 23 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/simtrace2 refs/changes/64/26864/1

diff --git a/host/include/osmocom/simtrace2/simtrace2_api.h b/host/include/osmocom/simtrace2/simtrace2_api.h
index d658d16..3a7e5ae 100644
--- a/host/include/osmocom/simtrace2/simtrace2_api.h
+++ b/host/include/osmocom/simtrace2/simtrace2_api.h
@@ -44,6 +44,7 @@
 int osmo_st2_slot_tx_msg(struct osmo_st2_slot *slot, struct msgb *msg,
                          uint8_t msg_class, uint8_t msg_type);
 
+int osmo_st2_generic_do_error_none(struct osmo_st2_cardem_inst *ci);
 
 int osmo_st2_cardem_request_card_insert(struct osmo_st2_cardem_inst *ci, bool inserted);
 int osmo_st2_cardem_request_pb_and_rx(struct osmo_st2_cardem_inst *ci, uint8_t pb, uint8_t le);
diff --git a/host/lib/simtrace2_api.c b/host/lib/simtrace2_api.c
index 4ad7eb7..beb6de4 100644
--- a/host/lib/simtrace2_api.c
+++ b/host/lib/simtrace2_api.c
@@ -155,6 +155,24 @@
 }
 
 /***********************************************************************
+ * Generic protocol
+ ***********************************************************************/
+
+/*! \brief Send an empty DO_ERROR message to the simtrace2 board */
+int osmo_st2_generic_do_error_none(struct osmo_st2_cardem_inst *ci)
+{
+	struct msgb *msg = st_msgb_alloc();
+	struct cardemu_usb_msg_error *err;
+
+	LOGSLOT(ci->slot, LOGL_NOTICE, "<= %s\n", __func__);
+
+	err = (struct cardemu_usb_msg_error *) msgb_put(msg, sizeof(*err));
+	memset(err, 0, sizeof(*err));
+
+	return osmo_st2_slot_tx_msg(ci->slot, msg, SIMTRACE_MSGC_GENERIC, SIMTRACE_CMD_DO_ERROR);
+}
+
+/***********************************************************************
  * Card Emulation protocol
  ***********************************************************************/
 
diff --git a/host/src/simtrace2-tool.c b/host/src/simtrace2-tool.c
index d92638f..407eac9 100644
--- a/host/src/simtrace2-tool.c
+++ b/host/src/simtrace2-tool.c
@@ -297,6 +297,10 @@
 				fprintf(stderr, "can't obtain EP addrs; rc=%d\n", rc);
 				goto close_exit;
 			}
+
+			// HACK: kick the board with a fake message to get subsequent messages to be accepted
+			// TODO: figure out the real problem, and remove this
+			osmo_st2_generic_do_error_none(ci);
 		}
 
 		if (argc - optind <= 0) {

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