[modules][serial] fix simple module ability to send

src/mesh/Channels.cpp

@@ -196,6 +196,17 @@ Channel &Channels::getByIndex(ChannelIndex chIndex)
     return *ch;
 }
 
+Channel &Channels::getByName(const char* chName)
+{
+    for (ChannelIndex i = 0; i < getNumChannels(); i++) {
+        if (strcasecmp(channelFile.channels[i].settings.name, chName) == 0) {
+            return channelFile.channels[i];
+        }
+    }
+
+    return getByIndex(getPrimaryIndex());
+}
+
 void Channels::setChannel(const Channel &c)
 {
     Channel &old = getByIndex(c.index);

src/mesh/Channels.h

@@ -40,6 +40,9 @@ class Channels
     /** Return the Channel for a specified index */
     Channel &getByIndex(ChannelIndex chIndex);
 
+     /** Return the Channel for a specified name, return primary if not found */
+    Channel &getByName(const char* chName);
+
     /** Using the index inside the channel, update the specified channel's settings and role.  If this channel is being promoted
      * to be primary, force all other channels to be secondary.
      */

src/modules/SerialModule.cpp

@@ -221,8 +221,12 @@ MeshPacket *SerialModuleRadio::allocReply()
 
 void SerialModuleRadio::sendPayload(NodeNum dest, bool wantReplies)
 {
+    Channel *ch = (boundChannel != NULL) ? &channels.getByName(boundChannel) : NULL;
     MeshPacket *p = allocReply();
     p->to = dest;
+    if (ch != NULL) {
+        p->channel = ch->index;
+    }
     p->decoded.want_response = wantReplies;
 
     p->want_ack = ACK;