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scheduler.c: Print message when burst substitution happens

Whenever we receive discontinuous frame numbers from the TRX socket,
osmo-bts-trx is substituting zero-filled bursts for those frame numbers
which we missed.  Don't just do this silently, but actually log about
it, as it is an error.

Note: This [currently] happens when using a virtual air interface with trxcon
as opposed to a real SDR receiver with osmo-trx.

Change-Id: If79eab37c80647c9ab64f399fa4676d97af3e9ad
M src/common/scheduler.c
1 file changed, 4 insertions(+), 1 deletion(-)

  git pull ssh:// refs/changes/70/6870/1

diff --git a/src/common/scheduler.c b/src/common/scheduler.c
index 4e48160..e6e7eaf 100644
--- a/src/common/scheduler.c
+++ b/src/common/scheduler.c
@@ -1725,8 +1725,11 @@
                        func(l1t, tn, fn, chan, bid, bits, nbits, rssi, toa);
                } else if (chan != TRXC_RACH && !l1cs->ho_rach_detect) {
                        sbit_t spare[GSM_BURST_LEN];
                        memset(spare, 0, GSM_BURST_LEN);
+                       /* We missed a couple of frame numbers (system 
overload?) and are now
+                        * substituting some zero-filled bursts for those 
bursts we missed */
+                       LOGPFN(DL1P, LOGL_ERROR, fn, "Substituting all-zero 
burst (current_fn=%u, "
+                               "elapsed=%u\n", current_fn, elapsed);
                        func(l1t, tn, fn, chan, bid, spare, GSM_BURST_LEN, 
-128, 0);

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Gerrit-MessageType: newchange
Gerrit-Change-Id: If79eab37c80647c9ab64f399fa4676d97af3e9ad
Gerrit-PatchSet: 1
Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Owner: Harald Welte <>

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