Add additional Epoch check for time set #7375
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We have two perhapsSetRTC functions, which are called to set the time. The one with 3 parameters had a helpful check to reject an invalid time, by comparing the time from the source against when the firmware was compiled. The one with 2 parameters, which is called from the GPS lookForTime did not. As a result, certain GPS with bad time handling could set a time that was in the past. This patch adds the same epoch check code to the other perhapsSetRTC method. Fixes meshtastic#7364
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Great catch! |
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Tested OK by a T114 user! |
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Native tests are failing after this merge 😬 |
oscgonfer
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Jul 22, 2025
We have two perhapsSetRTC functions, which are called to set the time. The one with 3 parameters had a helpful check to reject an invalid time, by comparing the time from the source against when the firmware was compiled. The one with 2 parameters, which is called from the GPS lookForTime did not. As a result, certain GPS with bad time handling could set a time that was in the past. This patch adds the same epoch check code to the other perhapsSetRTC method. Fixes meshtastic#7364
oscgonfer
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to fablabbcn/smartcitizen-meshtastic
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Jul 23, 2025
We have two perhapsSetRTC functions, which are called to set the time. The one with 3 parameters had a helpful check to reject an invalid time, by comparing the time from the source against when the firmware was compiled. The one with 2 parameters, which is called from the GPS lookForTime did not. As a result, certain GPS with bad time handling could set a time that was in the past. This patch adds the same epoch check code to the other perhapsSetRTC method. Fixes meshtastic#7364
fifieldt
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Aug 27, 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
fifieldt
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Aug 27, 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
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
pushed a commit
that referenced
this pull request
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]>
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
mehow
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to mehow/meshtastic-firmware
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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
pkoryzna
pushed a commit
to pkoryzna/meshtastic-firmware-why2025-carrier
that referenced
this pull request
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
pushed a commit
to pkoryzna/meshtastic-firmware-why2025-carrier
that referenced
this pull request
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]>
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We have two perhapsSetRTC functions, which are called to set the time.
The one with 3 parameters had a helpful check to reject an invalid time, by comparing the time from the source against when the firmware was compiled. The one with 2 parameters, which is called from the GPS lookForTime did not.
As a result, certain GPS with bad time handling could set a time that was in the past.
This patch adds the same epoch check code to the other perhapsSetRTC method.
Fixes #7364