We don't gotTime if time is 2019. #7772
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There are certain GPS chips that have a hard-coded time in firmware that they will return before lock. We set our own hard-coded time, BUILD_EPOCH, that should be newer and use the comparison to not set a bad time. In meshtastic#7261 we introduced the RTCSetResult and improved it in meshtastic#7375 . However, the original try-fix left logic in GPS.cpp that could still result in broadcasting the bad time. Further, as part of our fix we cleared the GPS buffer if we didn't get a good time. The mesh was hurting at the time, so this was a reasonable approach. However, given time tends to come in when we're trying to get early lock, this had the potential side effect of throwing away valuable information to get position lock. This change reverses the clearBuffer and changes the logic so if time is not set it will not be broadcast. Fixes meshtastic#7771 Fixes meshtastic#7750
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My GPS testing list:
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No regressions on 3 common chips, marking as ready for review |
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Seems OK on T1000E after testing. |
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Looks good. Seems like a fix we'd want to target at master? |
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Probably ... but I don't know when to do develop and when to do master at this stage :) Help! |
fifieldt
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Further to meshtastic#7772 , we discovered that some RTCs have hard-coded start times well in the past. This patch gives RTCs the same treatment as GPS - if the time is earlier than BUILD_EPOCH, we don't use it. Fixes meshtastic#7771 Fixes meshtastic#7750
fifieldt
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Aug 28, 2025
Further to meshtastic#7772 , we discovered that some RTCs have hard-coded start times well in the past. This patch gives RTCs the same treatment as GPS - if the time is earlier than BUILD_EPOCH, we don't use it. Fixes meshtastic#7771 Fixes meshtastic#7750
thebentern
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Aug 29, 2025
There are certain GPS chips that have a hard-coded time in firmware that they will return before lock. We set our own hard-coded time, BUILD_EPOCH, that should be newer and use the comparison to not set a bad time. In #7261 we introduced the RTCSetResult and improved it in #7375 . However, the original try-fix left logic in GPS.cpp that could still result in broadcasting the bad time. Further, as part of our fix we cleared the GPS buffer if we didn't get a good time. The mesh was hurting at the time, so this was a reasonable approach. However, given time tends to come in when we're trying to get early lock, this had the potential side effect of throwing away valuable information to get position lock. This change reverses the clearBuffer and changes the logic so if time is not set it will not be broadcast. Fixes #7771 Fixes #7750
thebentern
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Aug 29, 2025
* Merge pull request #7777 from meshtastic/create-pull-request/bump-version Bump release version * Only send Neighbours if we have some to send. (#7493) * Only send Neighbours if we have some to send. The original intent of NeighborInfo was that when a NeighbourInfo was sent all of the nodes that saw it would reply with NeighbourInfo. So, NeighbourInfo was sent even if there were no hop-zero nodes in the NodeDB. Since 2023, when this was implemented, our understanding of running city-wide meshes has improved substantially. We have taken steps to reduce the impact of NeighborInfo over LoRa. This change aligns with those ideas: we will now only send NeighborInfo if we have some neighbors to contribute. The impact of this change is that a node must first see another directly connected node in another packet type before NeighborInfo is sent. This means that a node with no neighbors is no longer able to trigger other nodes to broadcast NeighborInfo. It will, however, receive the regular periodic broadcast of NeighborInfo, and will be able to send NeighborInfo if it has at least 1 neighbor. * Include all the things * AvOid memleak * We don't gotTime if time is 2019. (#7772) There are certain GPS chips that have a hard-coded time in firmware that they will return before lock. We set our own hard-coded time, BUILD_EPOCH, that should be newer and use the comparison to not set a bad time. In #7261 we introduced the RTCSetResult and improved it in #7375 . However, the original try-fix left logic in GPS.cpp that could still result in broadcasting the bad time. Further, as part of our fix we cleared the GPS buffer if we didn't get a good time. The mesh was hurting at the time, so this was a reasonable approach. However, given time tends to come in when we're trying to get early lock, this had the potential side effect of throwing away valuable information to get position lock. This change reverses the clearBuffer and changes the logic so if time is not set it will not be broadcast. Fixes #7771 Fixes #7750 --------- Co-authored-by: Tom Fifield <[email protected]>
thebentern
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thebentern
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alexl83
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Sep 2, 2025
There are certain GPS chips that have a hard-coded time in firmware that they will return before lock. We set our own hard-coded time, BUILD_EPOCH, that should be newer and use the comparison to not set a bad time. In meshtastic#7261 we introduced the RTCSetResult and improved it in meshtastic#7375 . However, the original try-fix left logic in GPS.cpp that could still result in broadcasting the bad time. Further, as part of our fix we cleared the GPS buffer if we didn't get a good time. The mesh was hurting at the time, so this was a reasonable approach. However, given time tends to come in when we're trying to get early lock, this had the potential side effect of throwing away valuable information to get position lock. This change reverses the clearBuffer and changes the logic so if time is not set it will not be broadcast. Fixes meshtastic#7771 Fixes meshtastic#7750
alexl83
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Sep 2, 2025
Further to meshtastic#7772 , we discovered that some RTCs have hard-coded start times well in the past. This patch gives RTCs the same treatment as GPS - if the time is earlier than BUILD_EPOCH, we don't use it. Fixes meshtastic#7771 Fixes meshtastic#7750
mehow
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Sep 5, 2025
There are certain GPS chips that have a hard-coded time in firmware that they will return before lock. We set our own hard-coded time, BUILD_EPOCH, that should be newer and use the comparison to not set a bad time. In meshtastic#7261 we introduced the RTCSetResult and improved it in meshtastic#7375 . However, the original try-fix left logic in GPS.cpp that could still result in broadcasting the bad time. Further, as part of our fix we cleared the GPS buffer if we didn't get a good time. The mesh was hurting at the time, so this was a reasonable approach. However, given time tends to come in when we're trying to get early lock, this had the potential side effect of throwing away valuable information to get position lock. This change reverses the clearBuffer and changes the logic so if time is not set it will not be broadcast. Fixes meshtastic#7771 Fixes meshtastic#7750
mehow
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Sep 5, 2025
Further to meshtastic#7772 , we discovered that some RTCs have hard-coded start times well in the past. This patch gives RTCs the same treatment as GPS - if the time is earlier than BUILD_EPOCH, we don't use it. Fixes meshtastic#7771 Fixes meshtastic#7750
pkoryzna
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Sep 13, 2025
There are certain GPS chips that have a hard-coded time in firmware that they will return before lock. We set our own hard-coded time, BUILD_EPOCH, that should be newer and use the comparison to not set a bad time. In meshtastic#7261 we introduced the RTCSetResult and improved it in meshtastic#7375 . However, the original try-fix left logic in GPS.cpp that could still result in broadcasting the bad time. Further, as part of our fix we cleared the GPS buffer if we didn't get a good time. The mesh was hurting at the time, so this was a reasonable approach. However, given time tends to come in when we're trying to get early lock, this had the potential side effect of throwing away valuable information to get position lock. This change reverses the clearBuffer and changes the logic so if time is not set it will not be broadcast. Fixes meshtastic#7771 Fixes meshtastic#7750
pkoryzna
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Sep 13, 2025
* Merge pull request meshtastic#7777 from meshtastic/create-pull-request/bump-version Bump release version * Only send Neighbours if we have some to send. (meshtastic#7493) * Only send Neighbours if we have some to send. The original intent of NeighborInfo was that when a NeighbourInfo was sent all of the nodes that saw it would reply with NeighbourInfo. So, NeighbourInfo was sent even if there were no hop-zero nodes in the NodeDB. Since 2023, when this was implemented, our understanding of running city-wide meshes has improved substantially. We have taken steps to reduce the impact of NeighborInfo over LoRa. This change aligns with those ideas: we will now only send NeighborInfo if we have some neighbors to contribute. The impact of this change is that a node must first see another directly connected node in another packet type before NeighborInfo is sent. This means that a node with no neighbors is no longer able to trigger other nodes to broadcast NeighborInfo. It will, however, receive the regular periodic broadcast of NeighborInfo, and will be able to send NeighborInfo if it has at least 1 neighbor. * Include all the things * AvOid memleak * We don't gotTime if time is 2019. (meshtastic#7772) There are certain GPS chips that have a hard-coded time in firmware that they will return before lock. We set our own hard-coded time, BUILD_EPOCH, that should be newer and use the comparison to not set a bad time. In meshtastic#7261 we introduced the RTCSetResult and improved it in meshtastic#7375 . However, the original try-fix left logic in GPS.cpp that could still result in broadcasting the bad time. Further, as part of our fix we cleared the GPS buffer if we didn't get a good time. The mesh was hurting at the time, so this was a reasonable approach. However, given time tends to come in when we're trying to get early lock, this had the potential side effect of throwing away valuable information to get position lock. This change reverses the clearBuffer and changes the logic so if time is not set it will not be broadcast. Fixes meshtastic#7771 Fixes meshtastic#7750 --------- Co-authored-by: Tom Fifield <[email protected]>
pkoryzna
pushed a commit
to pkoryzna/meshtastic-firmware-why2025-carrier
that referenced
this pull request
Sep 13, 2025
Further to meshtastic#7772 , we discovered that some RTCs have hard-coded start times well in the past. This patch gives RTCs the same treatment as GPS - if the time is earlier than BUILD_EPOCH, we don't use it. Fixes meshtastic#7771 Fixes meshtastic#7750
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There are certain GPS chips that have a hard-coded time in firmware that they will return before lock. We set our own hard-coded time, BUILD_EPOCH, that should be newer and use the comparison to not set a bad time.
In #7261 we introduced the RTCSetResult and improved it in #7375 .
However, the original try-fix left logic in GPS.cpp that could still result in broadcasting the bad time.
Further, as part of our fix we cleared the GPS buffer if we didn't get a good time. The mesh was hurting at the time, so this was a reasonable approach. However, given time tends to come in when we're trying to get early lock, this had the potential side effect of throwing away valuable information to get position lock.
This change reverses the clearBuffer and changes the logic so if time is not set it will not be broadcast.
Fixes #7771
Fixes #7750