nrfCloud Unix timestamp for RSRP API request seems to be wrong

[Rudolph Aschmoneit]

Hey everyone,

I am playing around with Nordic Cloud, Thingy:91 with the Asset Tracker v1 and the Nordic Cloud RestAPI.

I happened to see in the process, that the unix timestamp value (ts) seems to be updated in a strange way, but only if I use RSRP for App ID.

It seems that the "received at" value works fine, but the ts value is constant for different "received at" values and then changes out of nowhere.

I could see this behaviour only for API calls with appID=RSRP, with appId=TEMP everything seems to be fine. My API calls are:

https://api.nrfcloud.com/v1/messages?appId=TEMP&deviceIdentifiers=nrf-XXXXXXXXXXXXXXX&inclusiveStart=2020-12-01T00:00:00.000Z&exclusiveEnd=2031-02-15T00:00:00.000Z&pageLimit=20

and

api.nrfcloud.com/.../messagesXXXXXXXXXXXXXXX&inclusiveStart=2020-12-01T00:00:00.000Z&exclusiveEnd=2031-02-15T00:00:00.000Z&pageLimit=20

The responses are for TEMP:

{
"items": [
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:17:02.740Z",
"message": {
"data": "14.2",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481421267
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:16:32.452Z",
"message": {
"data": "14.4",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481391259
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:16:02.895Z",
"message": {
"data": "14.6",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481361214
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:15:32.369Z",
"message": {
"data": "14.8",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481331205
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:15:04.199Z",
"message": {
"data": "15.0",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481301160
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:14:32.367Z",
"message": {
"data": "15.2",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481271152
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:14:03.951Z",
"message": {
"data": "15.4",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481241107
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:13:32.268Z",
"message": {
"data": "15.7",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481211098
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:13:02.789Z",
"message": {
"data": "15.9",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481181053
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:12:32.277Z",
"message": {
"data": "16.2",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481151044
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:12:02.478Z",
"message": {
"data": "16.5",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481121000
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:11:32.203Z",
"message": {
"data": "16.9",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481090991
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:11:02.392Z",
"message": {
"data": "17.3",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481060946
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:10:32.196Z",
"message": {
"data": "17.7",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481030937
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:10:02.573Z",
"message": {
"data": "18.2",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613481000892
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:09:31.137Z",
"message": {
"data": "18.8",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613480970863
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:09:02.356Z",
"message": {
"data": "19.4",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613480940818
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:08:31.137Z",
"message": {
"data": "19.7",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613480910809
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:40:22.119Z",
"message": {
"data": "15.6",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613479220878
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:33:52.338Z",
"message": {
"data": "9.4",
"messageType": "DATA",
"appId": "TEMP",
"ts": 1613478830845
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
}
],
"total": 901,
"pageNextToken": "DnF1ZXJ5VGhlbkZldGNoBQAAAAAH4yxWFi13ZjY1eFBxUU1henJ4RkNER1Zjc2cAAAAABptrBxZYTFF2cTdYMFNnZWdNaUF6Rjc4ZS1nAAAAAAfjLFcWLXdmNjV4UHFRTWF6cnhGQ0RHVmNzZwAAAAAH4yxYFi13ZjY1eFBxUU1henJ4RkNER1Zjc2cAAAAAB0-kLBYwY3JNNVluZVIxZUdmN1pXYmpYMHB3"
}

And for RSRP:

{
"items": [
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:15:32.367Z",
"message": {
"data": "-72",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613480519417
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:14:32.367Z",
"message": {
"data": "-75",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613480519417
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:13:32.267Z",
"message": {
"data": "-74",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613480519417
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:12:32.274Z",
"message": {
"data": "-72",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613480519417
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:11:32.202Z",
"message": {
"data": "-74",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613480519417
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:10:32.194Z",
"message": {
"data": "-72",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613480519417
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T13:09:29.288Z",
"message": {
"data": "-75",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613480519417
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:40:11.880Z",
"message": {
"data": "-79",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:33:22.839Z",
"message": {
"data": "-70",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:23:32.812Z",
"message": {
"data": "-69",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:22:32.518Z",
"message": {
"data": "-70",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:21:32.439Z",
"message": {
"data": "-71",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:20:32.405Z",
"message": {
"data": "-69",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:19:32.487Z",
"message": {
"data": "-71",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:18:05.044Z",
"message": {
"data": "-69",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:11:22.132Z",
"message": {
"data": "-69",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:10:22.036Z",
"message": {
"data": "-71",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:09:21.968Z",
"message": {
"data": "-69",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:08:22.107Z",
"message": {
"data": "-70",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
},
{
"topic": "prod/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/m/d/nrf-XXXXXXXXXXXXXXX/d2c",
"deviceId": "nrf-XXXXXXXXXXXXXXX",
"receivedAt": "2021-02-16T12:07:21.655Z",
"message": {
"data": "-69",
"messageType": "DATA",
"appId": "RSRP",
"ts": 1613468521413
},
"tenantId": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
}
],
"total": 367,
"pageNextToken": "DnF1ZXJ5VGhlbkZldGNoBQAAAAAH4ysyFi13ZjY1eFBxUU1henJ4RkNER1Zjc2cAAAAAB-MrMxYtd2Y2NXhQcVFNYXpyeEZDREdWY3NnAAAAAAdPo08WMGNyTTVZbmVSMWVHZjdaV2JqWDBwdwAAAAAH4ys0Fi13ZjY1eFBxUU1henJ4RkNER1Zjc2cAAAAAB0-jThYwY3JNNVluZVIxZUdmN1pXYmpYMHB3"
}

 

Best Regards

Rudolph

[Hakon]

Hello,

ts is the timestamp set in the message on the device, when the reading is actually taken. receivedAt is when the cloud actually receives it. So if messages are only sent periodically, you could see "discrepancies" like this.

[Rudolph Aschmoneit]

Hey, thanks for your reply. That make's totally sense. Accordingly, I can assume that the RSRP Value is not measured as often as the e.g. TEMP value? I had only wondered because I could only observe it with the RSRP value.