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bootstrap RTC from contact.lastmod and improve slot overwrite logic

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slot overwrite logic can now safely use contact.lastmod to find oldest contact for overwrite
This commit is contained in:
taco 2026-01-13 04:27:27 +11:00
parent 741564dd48
commit df6687034a
3 changed files with 18 additions and 7 deletions
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1
examples/companion_radio/MyMesh.cpp
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@ -862,6 +862,7 @@ void MyMesh::begin(bool has_display) {
resetContacts();
_store->loadContacts(this);
bootstrapRTCfromContacts();
addChannel("Public", PUBLIC_GROUP_PSK); // pre-configure Andy's public channel
_store->loadChannels(this);

23
src/helpers/BaseChatMesh.cpp
View file

@ -55,17 +55,29 @@ void BaseChatMesh::sendAckTo(const ContactInfo& dest, uint32_t ack_hash) {
}
}
void BaseChatMesh::bootstrapRTCfromContacts() {
uint32_t latest = 0;
for (int i = 0; i < num_contacts; i++) {
if (contacts[i].lastmod > latest) {
latest = contacts[i].lastmod;
}
}
if (latest != 0) {
getRTCClock()->setCurrentTime(latest + 1);
}
}
ContactInfo* BaseChatMesh::allocateContactSlot() {
if (num_contacts < MAX_CONTACTS) {
return &contacts[num_contacts++];
} else if (shouldOverwriteWhenFull()) {
// Find oldest non-favourite contact by last_advert_timestamp
// Find oldest non-favourite contact by oldest lastmod timestamp
int oldest_idx = -1;
uint32_t oldest_timestamp = 0xFFFFFFFF;
uint32_t oldest_lastmod = 0xFFFFFFFF;
for (int i = 0; i < num_contacts; i++) {
bool is_favourite = (contacts[i].flags & 0x01) != 0;
if (!is_favourite && contacts[i].last_advert_timestamp < oldest_timestamp) {
oldest_timestamp = contacts[i].last_advert_timestamp;
if (!is_favourite && contacts[i].lastmod < oldest_lastmod) {
oldest_lastmod = contacts[i].lastmod;
oldest_idx = i;
}
}
@ -750,9 +762,6 @@ bool BaseChatMesh::addContact(const ContactInfo& contact) {
ContactInfo* dest = allocateContactSlot();
if (dest) {
*dest = contact;
if (dest->last_advert_timestamp == 0) { // ensure non-zero timestamp to prevent contacts added from discover list being considered 'oldest'
dest->last_advert_timestamp = getRTCClock()->getCurrentTimeUnique();
}
dest->shared_secret_valid = false; // mark shared_secret as needing calculation
return true; // success
}

1
src/helpers/BaseChatMesh.h
View file

@ -88,6 +88,7 @@ protected:
memset(connections, 0, sizeof(connections));
}
void bootstrapRTCfromContacts();
void resetContacts() { num_contacts = 0; }
void populateContactFromAdvert(ContactInfo& ci, const mesh::Identity& id, const AdvertDataParser& parser, uint32_t timestamp);
ContactInfo* allocateContactSlot(); // helper to find slot for new contact