Retain and isolate delayed Companion results under backpressure

src/helpers/BaseChatMesh.cpp

@@ -819,6 +819,7 @@ int BaseChatMesh::sendAnonReq(const ContactInfo& recipient, const uint8_t* data,
   {
     uint8_t temp[MAX_PACKET_PAYLOAD];
     tag = getRTCClock()->getCurrentTimeUnique();
+    if (!allowRequestTag(tag)) return MSG_SEND_FAILED;
     memcpy(temp, &tag, 4);   // tag to match later (also extra blob to help make packet_hash unique)
     memcpy(&temp[4], data, len);
 
@@ -846,6 +847,7 @@ int  BaseChatMesh::sendRequest(const ContactInfo& recipient, const uint8_t* req_
   {
     uint8_t temp[MAX_PACKET_PAYLOAD];
     tag = getRTCClock()->getCurrentTimeUnique();
+    if (!allowRequestTag(tag)) return MSG_SEND_FAILED;
     memcpy(temp, &tag, 4);   // mostly an extra blob to help make packet_hash unique
     memcpy(&temp[4], req_data, data_len);
 
@@ -871,6 +873,7 @@ int  BaseChatMesh::sendRequest(const ContactInfo& recipient, uint8_t req_type, u
   {
     uint8_t temp[13];
     tag = getRTCClock()->getCurrentTimeUnique();
+    if (!allowRequestTag(tag)) return MSG_SEND_FAILED;
     memcpy(temp, &tag, 4);   // mostly an extra blob to help make packet_hash unique
     temp[4] = req_type;
     memset(&temp[5], 0, 4);  // reserved (possibly for 'since' param)