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start msg sequence numbers with a random number each boot

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geeksville
2020-05-01 08:51:53 -07:00
parent 31eb2f5337
commit 5a4fab2506
5 changed files with 14 additions and 4 deletions
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10
src/mesh/MeshService.cpp
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@@ -61,8 +61,14 @@ static Periodic sendOwnerPeriod(sendOwnerCb);
// FIXME, move this someplace better
PacketId generatePacketId()
{
static uint32_t i __attribute__((
section(".noinit"))); // We try to keep this in noinit so that hopefully it keeps increasing even across reboots
static uint32_t i; // Note: trying to keep this in noinit didn't help for working across reboots
static bool didInit = false;
if (!didInit) {
didInit = true;
i = random(0, NUM_PACKET_ID +
1); // pick a random initial sequence number at boot (to prevent repeated reboots always starting at 0)
}
i++;
return (i % NUM_PACKET_ID) + 1; // return number between 1 and 255