# Changelog
##  3.12.1 [2022-08-29]
### Fixes
- [193](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/193) - Automatically adjusting point timestamp  according to the setting of write precision. 

## 3.12.0 [2022-03-21]
### Features
- [185](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/185) - Added diagnostic server connection state getter `bool InfluxDBClient::isConnected()`

## 3.11.0 [2022-02-18]
### Features
 - [174](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/174),[181](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/181) - All API methods with a string param allow specifying string by all basic types:
  - Arduino `String` class
  - C `char *` or `char[]` 
  - Flash string using `F`,`PSTR` or `FPSTR` macros
### Fixes 
 - [176](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/176) - Cleared all compiler warnings

## 3.10.0 [2022-01-20]
### Features
 - [167](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/167) - Added `InfluxDBClient::writeRecord(const char *record)`.
 - [167](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/167) - Added possibility to disable retrying by setting `maxRetryAttempts` to zero: `client.setWriteOptions(WriteOptions().maxRetryAttempts(0));` 
 - [172](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/172) - Added directly streaming batch for write. It can be enabled by `InfluxDBClient::setStreamWrite(bool enable = true)`. Writing by streaming lines of batch saves RAM as it sends data without allocating a buffer. On the other hand, this way of writing is about half times slower than the classic way, when allocating the buffer for writing the whole batch. 
  - [172](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/172) - Allowing larger batch size, > 255.
  - [173](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/173) - Added Flux query parameters. Now supported by InfluxDB Cloud only.

## 3.9.0 [2021-09-17]
### Features
 - [#147](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/147) - Updated InfluxDB 2 Cloud CA root certificate to _ISRG Root X1_.   
 Current InfluxDB 2 Cloud CA root certificate _DST Root CA X3_ expires on September 30th 2021!
 - [#157](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/157) - Added Buckets sub-client for managing buckets in InfluxDB 2. 
 
### Fixes
 - [#150](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/150) - `HTTPOptions::httpReadTimeout` is also set as the connect timeout for HTTP connection on ESP32. It also works for HTTPS connection since ESP32 Arduino Core 2.0.0. 
 - [#156](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/156) - Correctly rounding _writeBufferSize_, when _bufferSize/batchSize >= 256_. 
 - [#162](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/162) - Fixed flushing of not full buffer after the flush timeout.

 ### Documentation
 - [#163](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/163) - More precise description of supported devices.

## 3.8.0 [2021-04-01]
### Features
 - [#143](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/143) - `InfluxDBClient::setInsecure` now works also for ESP32. Requires Arduino ESP32 SDK 1.0.5 or higher

### Documentation
 - [#134](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/134):
   - Added untrusted connection (skipping certificate validation) info to Readme
   - `SecureWrite` and `SecureBatchWrite` demos enhanced with example about using untrusted connection
   - Various fixes of typos

### Fixes
 - [#137](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/137) - Fixed parsing Flux response with unexpected annotations

## 3.7.0 [2020-12-24]
### Features
 - [#125](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/124) - Added credentials to the InfluxDB 1.x validation endpoint (/ping). To leverage this, [enable ping authentication](https://docs.influxdata.com/influxdb/v1.8/administration/config/#ping-auth-enabled-false) 

### Fixes
 - [#129](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/129) - Updated InfluxDB 2 Cloud CA certificate to trust servers from all cloud providers (AWS, Azure, GCP)

## 3.6.1 [2020-11-30]
### Features
### Fixes
- [#121](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/121) - Fixed compile error in case of warning is treated as an error
- [#122](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/122) - Deleting WiFiClient instance to avoid memory leaking when the InfluxDBClient is reinitialized
- [#124](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/124) - Fixed compilation warnings

### Doc
- [#120](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/120) - Improved language wording in the Readme

## 3.6.0 [2020-11-10]
### Features
- [#117](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/117) - Added `InfluxDBClient::pointToLineProtocol(const Point& point)` for simple creation of InfluxDB line-protocol string with respect to default tags

### Fixes
- [#114](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/114) - Renamed `getRemaingRetryTime()`->`getRemainingRetryTime()`
- [#115](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/115) - Restored writing capability after a connection failure
- [#118](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/118) - Added escaping of URL params (org, bucker, V1 username and pass)

## 3.5.0 [2020-10-30]
### Features
 - [#107](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/107) - Added possibility to set default tags. Use `WriteOptions::addDefaultTag()` to add a tag that will be added to each written point using the `writePoint()` function.
 - [#109](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/109) - Retry strategy improvements:
   - Added `canSendRequest()` function to check if retry strategy is applied
   - Added `getRemaingRetryTime()` function to get wait time before another request (write/query) can be sent
   - Removed applying retry wait time in case of network error
   - Better explanatory error message when a request is about to be sent in the retry wait state

### Fixes
- [#108](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/108) - Added optional param for specifying decimal places of double.: `void Point::addField(String name, double value, int decimalPlaces = 2)`
- [#111](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/111) - Fixed blocked writing after another point reached max retry count (#110)

## 3.4.0 [2020-10-02]
### Features
 - [#89](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/89) - ESP8266 only - Added Max Fragment Length Negotiation for TLS communication to reduce memory allocation. If server supports MFLN, it saves ~10kB. Standalone InfluxDB OSS server doesn't support MFLN, Cloud yes. To leverage MFLN for standalone OSS, a reverse proxy needs to be used. 
 - [#91](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/91) - Improved API for settings of write and HTTP options:
    - Introduced `WriteOptions` to wrap the write related options (write precision, batch-size, etc). It offers fluent style API allowing to change only the required options. `InfluxDBClient` has overloaded `setWriteOptions(const WriteOptions& writeOptions)` method.
    - Introduced `HTTPOptions` to wrap the HTTP related options (e.g. reusing connection). It offers fluent style API allowing to change only the required options. `InfluxDBClient` has `setHTTPOptions(const HTTPOptions& httpOptions)` method.
    - Added possibility to set HTTP response read timeout (part of the `HTTPOptions`).
    - Method `InfluxDBClient::void setWriteOptions(WritePrecision precision, uint16_t batchSize = 1, uint16_t bufferSize = 5, uint16_t flushInterval = 60, bool preserveConnection = true)` is deprecated and it will be removed in the next release.
 - [#93](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/93) - Write logic improvements 
   - Retry on failure logic unification with other InfluxDB clients (exponential retry, max retry count 3, max retry interval)
   - Better write buffer memory management

### Documentation
 - [#87](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/87) - Fixed include file name in the Readme
 - [#99](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/99) - Changed default InfluxDB 2 port from 9999 to 8086 (default since InfluxDB 2 RC0)

### Fixes
 - [#90](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/90) - Fixed boolean type recognition of InfluxDB Flux
 - [#101](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/101) - Better memory efficient point line composition

## Version 3.3.0 (2020-07-07)
 - [NEW] Added possibility skip server certification validation (`setInsecure()` method)
 - [NEW] Added possibility to query flux on secured InfluxDB 1.8 using V1 approach
 - [NEW] `validateConnection()` can be used also for the [forward compatibility](https://docs.influxdata.com/influxdb/latest/tools/api/#influxdb-2-0-api-compatibility-endpoints) connection to InfluxDB 1.8
 - [FIX] More precise default timestamp generating, up to microseconds
 - [FIX] Debug compilation error
 - [FIX] SecureBatchWrite compile error
 
## Version 3.2.0 (2020-06-09)
- [NEW] Added possibility to read data from InfluxDB using Flux queries
- [NEW] `timeSync` utility function for synchronous time synchronization using NTP 
- [FIX] Properly initialize member variable (#59)
- [FIX] ASCII chars & compilation warning fix (#60)
- [Update] ESP8266 SDK 2.7+ required

## Version 3.1.3 (2020-04-27)
 - [FIX] SecureWrite crash (#54)
 
## Version 3.1.2 (2020-04-18)
 - [FIX] Compilation error on fields order (#43)
 - [FIX] Invalid precision constant for microseconds (#49)
 - [FIX] Write error in case point has no tags (#50)

## Version 3.1.1 (2020-04-06)
 - [Updated] CA Certificate for SSL (#38)

## Version 3.1.0 (2020-03-12)
 - [NEW] Added User-agent header
 - [FIX] status code check when pinging an InfluxDB version 1.x instance

## Version 3.0.0 (2020-02-11)
 - New API with similar keywords as other official InfluxDB clients
 - Richer set of data types for fields and timestamp methods
 - Advanced features, such as implicit batching, automatic retrying on server back-pressure and connection failure, along with secured communication over TLS supported for both devices and authentication
 - Special characters escaping
 - Backward support for original API of V1/V2