From 2ebaf39c5a71d597481df1aa7051868dc4495237 Mon Sep 17 00:00:00 2001
From: Xavier Arteaga <xavier@softwareradiosystems.com>
Date: Fri, 13 Dec 2019 16:40:30 +0100
Subject: [PATCH] ZMQ: transmit zeros if buffer is not provided

---
 lib/src/phy/rf/rf_zmq_imp_tx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/src/phy/rf/rf_zmq_imp_tx.c b/lib/src/phy/rf/rf_zmq_imp_tx.c
index ff0a871af..8465cd799 100644
--- a/lib/src/phy/rf/rf_zmq_imp_tx.c
+++ b/lib/src/phy/rf/rf_zmq_imp_tx.c
@@ -131,7 +131,7 @@ static int _rf_zmq_tx_baseband(rf_zmq_tx_t* q, cf_t* buffer, uint32_t nsamples)
     }
 
     // convert samples if necessary
-    void *buf          = buffer;
+    void*    buf       = (buffer) ? buffer : q->zeros;
     uint32_t sample_sz = sizeof(cf_t);
 
     if (q->sample_format == ZMQ_TYPE_SC16) {