> For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://docs.ocpplab.io/llms.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.ocpplab.io/_mcp/server. # Send a command to a partner CPO POST https://api.ocpplab.io/ocpi/emsp/{version}/commands/{command} Content-Type: application/json Returns the CPO's immediate CommandResponse. The async CommandResult is delivered to the OCPI gateway's own callback; clients cannot set ``response_url``. Reference: https://docs.ocpplab.io/api-reference/ocpi/emsp/send-command ## Authentication - `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer `, where token is your auth token. ## Request ### Path parameters - `version` (enum, required) — OCPI version: ``211`` (2.1.1), ``221`` (2.2.1) or ``230`` (2.3.0). - Allowed values: `211`, `221`, `230` - `command` (enum, required) - Allowed values: `RESERVE_NOW`, `START_SESSION`, `STOP_SESSION`, `UNLOCK_CONNECTOR`, `CANCEL_RESERVATION` ### Query parameters - `partner_id` (integer, required) — Roaming partner to talk to (from ``GET /ocpi/partners``). ### Body (application/json) This endpoint expects a CommandSendRequest. - `token` (map from string to any, optional, nullable) — OCPI Token for the path version (validated by the gateway). - `location_id` (string, optional, nullable) - `evse_uid` (string, optional, nullable) - `connector_id` (string, optional, nullable) - `authorization_reference` (string, optional, nullable) - `session_id` (string, optional, nullable) - `reservation_id` (string, optional, nullable) - `expiry_date` (datetime, optional, nullable) ## Response ### 200 Successful Response - `partner_id` (integer, optional, nullable) - `command_type` (string, optional, nullable) - `result` (string, optional, nullable) - `command_result` (string, optional, nullable) - `timeout` (integer, optional, nullable) - `http_status` (integer, optional, nullable) - `ocpi_status_code` (integer, optional, nullable) - `duration_ms` (integer, optional, nullable) - `error` (string, optional, nullable) ## Errors ### 400 Bad Request Error Rejected by the gateway (business rule) - `detail` (string, required) — Human-readable error message returned by the API. ### 401 Unauthorized Error Missing or invalid Bearer token - `detail` (string, required) — Human-readable error message returned by the API. ### 404 Not Found Error Not found for this organization - `detail` (string, required) — Human-readable error message returned by the API. ### 422 Unprocessable Entity Error Validation Error - `detail` (list of ValidationError, optional) — One entry per invalid field. ### 429 Too Many Requests Error Gateway rate limit reached; retry after the given seconds - `detail` (string, required) — Human-readable error message returned by the API. ### 502 Bad Gateway Error Gateway unreachable, failing, or misconfigured - `detail` (string, required) — Human-readable error message returned by the API. ### 504 Gateway Timeout Error Gateway timed out - `detail` (string, required) — Human-readable error message returned by the API. ## Types ### ValidationError Why one field is invalid. - `loc` (list of ValidationErrorLocItems, required) — Where the field is: ``body`` / ``query`` / ``path`` / ``header``, then its name. - `msg` (string, required) — What is wrong, in English. - `type` (string, required) — Machine-readable error code, e.g. ``missing``. - `input` (any, optional) — The value that was sent. - `ctx` (ValidationErrorCtx, optional) — Details of the rule that failed, e.g. `{"le": 200}`. ### ValidationErrorLocItems ### ValidationErrorCtx Details of the rule that failed, e.g. `{"le": 200}`. ## Examples **Request** ```json { "token": { "country_code": "DE", "party_id": "EMS", "uid": "04A2B3C4D5E6F7", "type": "RFID", "contract_id": "DE-EMS-C12345678-X", "issuer": "Example eMSP GmbH", "valid": true, "whitelist": "ALLOWED", "last_updated": "2026-09-30T10:00:00Z" }, "location_id": "LOC-AMS-1", "evse_uid": "EVSE-AMS-1-1" } ``` **Response** ```json { "partner_id": 7, "command_type": "START_SESSION", "result": "ACCEPTED", "timeout": 30, "http_status": 200, "ocpi_status_code": 1000, "duration_ms": 180 } ``` **SDK Code** ```python import requests url = "https://api.ocpplab.io/ocpi/emsp/221/commands/START_SESSION" querystring = {"partner_id":"7"} payload = { "token": { "country_code": "DE", "party_id": "EMS", "uid": "04A2B3C4D5E6F7", "type": "RFID", "contract_id": "DE-EMS-C12345678-X", "issuer": "Example eMSP GmbH", "valid": True, "whitelist": "ALLOWED", "last_updated": "2026-09-30T10:00:00Z" }, "location_id": "LOC-AMS-1", "evse_uid": "EVSE-AMS-1-1" } headers = { "Authorization": "Bearer ", "Content-Type": "application/json" } response = requests.post(url, json=payload, headers=headers, params=querystring) print(response.json()) ``` ```javascript const url = 'https://api.ocpplab.io/ocpi/emsp/221/commands/START_SESSION?partner_id=7'; const options = { method: 'POST', headers: {Authorization: 'Bearer ', 'Content-Type': 'application/json'}, body: '{"token":{"country_code":"DE","party_id":"EMS","uid":"04A2B3C4D5E6F7","type":"RFID","contract_id":"DE-EMS-C12345678-X","issuer":"Example eMSP GmbH","valid":true,"whitelist":"ALLOWED","last_updated":"2026-09-30T10:00:00Z"},"location_id":"LOC-AMS-1","evse_uid":"EVSE-AMS-1-1"}' }; try { const response = await fetch(url, options); const data = await response.json(); console.log(data); } catch (error) { console.error(error); } ``` ```go package main import ( "fmt" "strings" "net/http" "io" ) func main() { url := "https://api.ocpplab.io/ocpi/emsp/221/commands/START_SESSION?partner_id=7" payload := strings.NewReader("{\n \"token\": {\n \"country_code\": \"DE\",\n \"party_id\": \"EMS\",\n \"uid\": \"04A2B3C4D5E6F7\",\n \"type\": \"RFID\",\n \"contract_id\": \"DE-EMS-C12345678-X\",\n \"issuer\": \"Example eMSP GmbH\",\n \"valid\": true,\n \"whitelist\": \"ALLOWED\",\n \"last_updated\": \"2026-09-30T10:00:00Z\"\n },\n \"location_id\": \"LOC-AMS-1\",\n \"evse_uid\": \"EVSE-AMS-1-1\"\n}") req, _ := http.NewRequest("POST", url, payload) req.Header.Add("Authorization", "Bearer ") req.Header.Add("Content-Type", "application/json") res, _ := http.DefaultClient.Do(req) defer res.Body.Close() body, _ := io.ReadAll(res.Body) fmt.Println(res) fmt.Println(string(body)) } ``` ```ruby require 'uri' require 'net/http' url = URI("https://api.ocpplab.io/ocpi/emsp/221/commands/START_SESSION?partner_id=7") http = Net::HTTP.new(url.host, url.port) http.use_ssl = true request = Net::HTTP::Post.new(url) request["Authorization"] = 'Bearer ' request["Content-Type"] = 'application/json' request.body = "{\n \"token\": {\n \"country_code\": \"DE\",\n \"party_id\": \"EMS\",\n \"uid\": \"04A2B3C4D5E6F7\",\n \"type\": \"RFID\",\n \"contract_id\": \"DE-EMS-C12345678-X\",\n \"issuer\": \"Example eMSP GmbH\",\n \"valid\": true,\n \"whitelist\": \"ALLOWED\",\n \"last_updated\": \"2026-09-30T10:00:00Z\"\n },\n \"location_id\": \"LOC-AMS-1\",\n \"evse_uid\": \"EVSE-AMS-1-1\"\n}" response = http.request(request) puts response.read_body ``` ```java import com.mashape.unirest.http.HttpResponse; import com.mashape.unirest.http.Unirest; HttpResponse response = Unirest.post("https://api.ocpplab.io/ocpi/emsp/221/commands/START_SESSION?partner_id=7") .header("Authorization", "Bearer ") .header("Content-Type", "application/json") .body("{\n \"token\": {\n \"country_code\": \"DE\",\n \"party_id\": \"EMS\",\n \"uid\": \"04A2B3C4D5E6F7\",\n \"type\": \"RFID\",\n \"contract_id\": \"DE-EMS-C12345678-X\",\n \"issuer\": \"Example eMSP GmbH\",\n \"valid\": true,\n \"whitelist\": \"ALLOWED\",\n \"last_updated\": \"2026-09-30T10:00:00Z\"\n },\n \"location_id\": \"LOC-AMS-1\",\n \"evse_uid\": \"EVSE-AMS-1-1\"\n}") .asString(); ``` ```php request('POST', 'https://api.ocpplab.io/ocpi/emsp/221/commands/START_SESSION?partner_id=7', [ 'body' => '{ "token": { "country_code": "DE", "party_id": "EMS", "uid": "04A2B3C4D5E6F7", "type": "RFID", "contract_id": "DE-EMS-C12345678-X", "issuer": "Example eMSP GmbH", "valid": true, "whitelist": "ALLOWED", "last_updated": "2026-09-30T10:00:00Z" }, "location_id": "LOC-AMS-1", "evse_uid": "EVSE-AMS-1-1" }', 'headers' => [ 'Authorization' => 'Bearer ', 'Content-Type' => 'application/json', ], ]); echo $response->getBody(); ``` ```csharp using RestSharp; var client = new RestClient("https://api.ocpplab.io/ocpi/emsp/221/commands/START_SESSION?partner_id=7"); var request = new RestRequest(Method.POST); request.AddHeader("Authorization", "Bearer "); request.AddHeader("Content-Type", "application/json"); request.AddParameter("application/json", "{\n \"token\": {\n \"country_code\": \"DE\",\n \"party_id\": \"EMS\",\n \"uid\": \"04A2B3C4D5E6F7\",\n \"type\": \"RFID\",\n \"contract_id\": \"DE-EMS-C12345678-X\",\n \"issuer\": \"Example eMSP GmbH\",\n \"valid\": true,\n \"whitelist\": \"ALLOWED\",\n \"last_updated\": \"2026-09-30T10:00:00Z\"\n },\n \"location_id\": \"LOC-AMS-1\",\n \"evse_uid\": \"EVSE-AMS-1-1\"\n}", ParameterType.RequestBody); IRestResponse response = client.Execute(request); ``` ```swift import Foundation let headers = [ "Authorization": "Bearer ", "Content-Type": "application/json" ] let parameters = [ "token": [ "country_code": "DE", "party_id": "EMS", "uid": "04A2B3C4D5E6F7", "type": "RFID", "contract_id": "DE-EMS-C12345678-X", "issuer": "Example eMSP GmbH", "valid": true, "whitelist": "ALLOWED", "last_updated": "2026-09-30T10:00:00Z" ], "location_id": "LOC-AMS-1", "evse_uid": "EVSE-AMS-1-1" ] as [String : Any] let postData = JSONSerialization.data(withJSONObject: parameters, options: []) let request = NSMutableURLRequest(url: NSURL(string: "https://api.ocpplab.io/ocpi/emsp/221/commands/START_SESSION?partner_id=7")! as URL, cachePolicy: .useProtocolCachePolicy, timeoutInterval: 10.0) request.httpMethod = "POST" request.allHTTPHeaderFields = headers request.httpBody = postData as Data let session = URLSession.shared let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in if (error != nil) { print(error as Any) } else { let httpResponse = response as? HTTPURLResponse print(httpResponse) } }) dataTask.resume() ```